Supplying a building or house, their rooms and corridors, with fresh air. The controlling of the environment thus may be in public or domestic sites and in medical or non-medical locales. (From Dorland, 28th ed)
Any method of artificial breathing that employs mechanical or non-mechanical means to force the air into and out of the lungs. Artificial respiration or ventilation is used in individuals who have stopped breathing or have RESPIRATORY INSUFFICIENCY to increase their intake of oxygen (O2) and excretion of carbon dioxide (CO2).
The total volume of gas inspired or expired per unit of time, usually measured in liters per minute.
Ventilatory support system using frequencies from 60-900 cycles/min or more. Three types of systems have been distinguished on the basis of rates, volumes, and the system used. They are high frequency positive-pressure ventilation (HFPPV); HIGH-FREQUENCY JET VENTILATION; (HFJV); and high-frequency oscillation (HFO).
Application of positive pressure to the inspiratory phase when the patient has an artificial airway in place and is connected to a ventilator.
The volume of air inspired or expired during each normal, quiet respiratory cycle. Common abbreviations are TV or V with subscript T.
A method of mechanical ventilation in which pressure is maintained to increase the volume of gas remaining in the lungs at the end of expiration, thus reducing the shunting of blood through the lungs and improving gas exchange.
Respiratory support system used primarily with rates of about 100 to 200/min with volumes of from about one to three times predicted anatomic dead space. Used to treat respiratory failure and maintain ventilation under severe circumstances.
Techniques for administering artificial respiration without the need for INTRATRACHEAL INTUBATION.
Techniques for effecting the transition of the respiratory-failure patient from mechanical ventilation to spontaneous ventilation, while meeting the criteria that tidal volume be above a given threshold (greater than 5 ml/kg), respiratory frequency be below a given count (less than 30 breaths/min), and oxygen partial pressure be above a given threshold (PaO2 greater than 50mm Hg). Weaning studies focus on finding methods to monitor and predict the outcome of mechanical ventilator weaning as well as finding ventilatory support techniques which will facilitate successful weaning. Present methods include intermittent mandatory ventilation, intermittent positive pressure ventilation, and mandatory minute volume ventilation.
The act of breathing with the LUNGS, consisting of INHALATION, or the taking into the lungs of the ambient air, and of EXHALATION, or the expelling of the modified air which contains more CARBON DIOXIDE than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (= OXYGEN CONSUMPTION) or cell respiration (= CELL RESPIRATION).
The physical or mechanical action of the LUNGS; DIAPHRAGM; RIBS; and CHEST WALL during respiration. It includes airflow, lung volume, neural and reflex controls, mechanoreceptors, breathing patterns, etc.
Mechanical devices used to produce or assist pulmonary ventilation.
The exchange of OXYGEN and CARBON DIOXIDE between alveolar air and pulmonary capillary blood that occurs across the BLOOD-AIR BARRIER.
A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.
The ratio of alveolar ventilation to simultaneous alveolar capillary blood flow in any part of the lung. (Stedman, 25th ed)
A procedure involving placement of a tube into the trachea through the mouth or nose in order to provide a patient with oxygen and anesthesia.
A clinical manifestation of abnormal increase in the amount of carbon dioxide in arterial blood.
A syndrome characterized by progressive life-threatening RESPIRATORY INSUFFICIENCY in the absence of known LUNG DISEASES, usually following a systemic insult such as surgery or major TRAUMA.
Lung damage that is caused by the adverse effects of PULMONARY VENTILATOR usage. The high frequency and tidal volumes produced by a mechanical ventilator can cause alveolar disruption and PULMONARY EDEMA.
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
RESPIRATORY MUSCLE contraction during INHALATION. The work is accomplished in three phases: LUNG COMPLIANCE work, that required to expand the LUNGS against its elastic forces; tissue resistance work, that required to overcome the viscosity of the lung and chest wall structures; and AIRWAY RESISTANCE work, that required to overcome airway resistance during the movement of air into the lungs. Work of breathing does not refer to expiration, which is entirely a passive process caused by elastic recoil of the lung and chest cage. (Guyton, Textbook of Medical Physiology, 8th ed, p406)
Measurement of oxygen and carbon dioxide in the blood.
The pressure that would be exerted by one component of a mixture of gases if it were present alone in a container. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.
The capability of the LUNGS to distend under pressure as measured by pulmonary volume change per unit pressure change. While not a complete description of the pressure-volume properties of the lung, it is nevertheless useful in practice as a measure of the comparative stiffness of the lung. (From Best & Taylor's Physiological Basis of Medical Practice, 12th ed, p562)
Surgical formation of an opening into the trachea through the neck, or the opening so created.
Techniques for supplying artificial respiration to a single lung.
The force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment.
Helium. A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. (Dorland, 27th ed)
Hospital units providing continuous surveillance and care to acutely ill patients.
A type of oropharyngeal airway that provides an alternative to endotracheal intubation and standard mask anesthesia in certain patients. It is introduced into the hypopharynx to form a seal around the larynx thus permitting spontaneous or positive pressure ventilation without penetration of the larynx or esophagus. It is used in place of a facemask in routine anesthesia. The advantages over standard mask anesthesia are better airway control, minimal anesthetic gas leakage, a secure airway during patient transport to the recovery area, and minimal postoperative problems.
Body ventilators that assist ventilation by applying intermittent subatmospheric pressure around the thorax, abdomen, or airway and periodically expand the chest wall and inflate the lungs. They are relatively simple to operate and do not require tracheostomy. These devices include the tank ventilators ("iron lung"), Portalung, Pneumowrap, and chest cuirass ("tortoise shell").
A condition of the newborn marked by DYSPNEA with CYANOSIS, heralded by such prodromal signs as dilatation of the alae nasi, expiratory grunt, and retraction of the suprasternal notch or costal margins, mostly frequently occurring in premature infants, children of diabetic mothers, and infants delivered by cesarean section, and sometimes with no apparent predisposing cause.
Devices that cover the nose and mouth to maintain aseptic conditions or to administer inhaled anesthetics or other gases. (UMDNS, 1999)
Measure of the maximum amount of air that can be breathed in and blown out over a sustained interval such as 15 or 20 seconds. Common abbreviations are MVV and MBC.
Measurement of the various processes involved in the act of respiration: inspiration, expiration, oxygen and carbon dioxide exchange, lung volume and compliance, etc.
Measurement of the amount of air that the lungs may contain at various points in the respiratory cycle.
Advanced and highly specialized care provided to medical or surgical patients whose conditions are life-threatening and require comprehensive care and constant monitoring. It is usually administered in specially equipped units of a health care facility.
That part of the RESPIRATORY TRACT or the air within the respiratory tract that does not exchange OXYGEN and CARBON DIOXIDE with pulmonary capillary blood.
Relatively complete absence of oxygen in one or more tissues.
Surgical incision of the trachea.
Physiologically, the opposition to flow of air caused by the forces of friction. As a part of pulmonary function testing, it is the ratio of driving pressure to the rate of air flow.
The number of times an organism breathes with the lungs (RESPIRATION) per unit time, usually per minute.
A transient absence of spontaneous respiration.
Damage to any compartment of the lung caused by physical, chemical, or biological agents which characteristically elicit inflammatory reaction. These inflammatory reactions can either be acute and dominated by NEUTROPHILS, or chronic and dominated by LYMPHOCYTES and MACROPHAGES.
A reduction in the amount of air entering the pulmonary alveoli.
The musculofibrous partition that separates the THORACIC CAVITY from the ABDOMINAL CAVITY. Contraction of the diaphragm increases the volume of the thoracic cavity aiding INHALATION.
The posture of an individual lying face down.
Application of positive pressure to the inspiratory phase of spontaneous respiration.
Inhalation of oxygen aimed at restoring toward normal any pathophysiologic alterations of gas exchange in the cardiopulmonary system, as by the use of a respirator, nasal catheter, tent, chamber, or mask. (From Dorland, 27th ed & Stedman, 25th ed)
Physiological processes and properties of the RESPIRATORY SYSTEM as a whole or of any of its parts.
Unstable isotopes of krypton that decay or disintegrate emitting radiation. Kr atoms with atomic weights 74-77, 79, 81, 85, and 87-94 are radioactive krypton isotopes.
A condition of lung damage that is characterized by bilateral pulmonary infiltrates (PULMONARY EDEMA) rich in NEUTROPHILS, and in the absence of clinical HEART FAILURE. This can represent a spectrum of pulmonary lesions, endothelial and epithelial, due to numerous factors (physical, chemical, or biological).
The circulation of the BLOOD through the LUNGS.
These include the muscles of the DIAPHRAGM and the INTERCOSTAL MUSCLES.
A pulmonary ventilation rate faster than is metabolically necessary for the exchange of gases. It is the result of an increased frequency of breathing, an increased tidal volume, or a combination of both. It causes an excess intake of oxygen and the blowing off of carbon dioxide.
A noble gas that is found in the atmosphere. It has the atomic symbol Kr, atomic number 36, atomic weight 83.80, and has been used in electric bulbs.
Absence of air in the entire or part of a lung, such as an incompletely inflated neonate lung or a collapsed adult lung. Pulmonary atelectasis can be caused by airway obstruction, lung compression, fibrotic contraction, or other factors.
Injury following pressure changes; includes injury to the eustachian tube, ear drum, lung and stomach.
Any hindrance to the passage of air into and out of the lungs.
A disease or state in which death is possible or imminent.
Removal of an endotracheal tube from the patient.
The volume of air remaining in the LUNGS at the end of a normal, quiet expiration. It is the sum of the RESIDUAL VOLUME and the EXPIRATORY RESERVE VOLUME. Common abbreviation is FRC.
Any disorder marked by obstruction of conducting airways of the lung. AIRWAY OBSTRUCTION may be acute, chronic, intermittent, or persistent.
Cells specialized to detect chemical substances and relay that information centrally in the nervous system. Chemoreceptor cells may monitor external stimuli, as in TASTE and OLFACTION, or internal stimuli, such as the concentrations of OXYGEN and CARBON DIOXIDE in the blood.
An infant during the first month after birth.
The act of BREATHING in.
Procedure in which patients are induced into an unconscious state through use of various medications so that they do not feel pain during surgery.
Elements of limited time intervals, contributing to particular results or situations.
The maintenance of certain aspects of the environment within a defined space to facilitate the function of that space; aspects controlled include air temperature and motion, radiant heat level, moisture, and concentration of pollutants such as dust, microorganisms, and gases. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
Excessive accumulation of extravascular fluid in the lung, an indication of a serious underlying disease or disorder. Pulmonary edema prevents efficient PULMONARY GAS EXCHANGE in the PULMONARY ALVEOLI, and can be life-threatening.
Pathological processes involving any part of the LUNG.
Mechanical ventilation delivered to match the patient's efforts in breathing as detected by the interactive ventilation device.
Health care provided to a critically ill patient during a medical emergency or crisis.
A general term encompassing lower MOTOR NEURON DISEASE; PERIPHERAL NERVOUS SYSTEM DISEASES; and certain MUSCULAR DISEASES. Manifestations include MUSCLE WEAKNESS; FASCICULATION; muscle ATROPHY; SPASM; MYOKYMIA; MUSCLE HYPERTONIA, myalgias, and MUSCLE HYPOTONIA.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
The motion of air currents.
Ventilation of the middle ear in the treatment of secretory (serous) OTITIS MEDIA, usually by placement of tubes or grommets which pierce the TYMPANIC MEMBRANE.
Care of patients with deficiencies and abnormalities associated with the cardiopulmonary system. It includes the therapeutic use of medical gases and their administrative apparatus, environmental control systems, humidification, aerosols, ventilatory support, bronchopulmonary drainage and exercise, respiratory rehabilitation, assistance with cardiopulmonary resuscitation, and maintenance of natural, artificial, and mechanical airways.
A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Small polyhedral outpouchings along the walls of the alveolar sacs, alveolar ducts and terminal bronchioles through the walls of which gas exchange between alveolar air and pulmonary capillary blood takes place.
Methods of creating machines and devices.
Hospital units providing continuous surveillance and care to acutely ill infants and children. Neonates are excluded since INTENSIVE CARE UNITS, NEONATAL is available.
Liquid perfluorinated carbon compounds which may or may not contain a hetero atom such as nitrogen, oxygen or sulfur, but do not contain another halogen or hydrogen atom. This concept includes fluorocarbon emulsions and fluorocarbon blood substitutes.
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
Serious INFLAMMATION of the LUNG in patients who required the use of PULMONARY VENTILATOR. It is usually caused by cross bacterial infections in hospitals (NOSOCOMIAL INFECTIONS).
A human infant born before 37 weeks of GESTATION.
Continuous recording of the carbon dioxide content of expired air.
An acronym for Acute Physiology and Chronic Health Evaluation, a scoring system using routinely collected data and providing an accurate, objective description for a broad range of intensive care unit admissions, measuring severity of illness in critically ill patients.
A disease of chronic diffuse irreversible airflow obstruction. Subcategories of COPD include CHRONIC BRONCHITIS and PULMONARY EMPHYSEMA.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
A technique of respiratory therapy, in either spontaneously breathing or mechanically ventilated patients, in which airway pressure is maintained above atmospheric pressure throughout the respiratory cycle by pressurization of the ventilatory circuit. (On-Line Medical Dictionary [Internet]. Newcastle upon Tyne(UK): The University Dept. of Medical Oncology: The CancerWEB Project; c1997-2003 [cited 2003 Apr 17]. Available from: http://cancerweb.ncl.ac.uk/omd/)
The period of confinement of a patient to a hospital or other health facility.
Substances and drugs that lower the SURFACE TENSION of the mucoid layer lining the PULMONARY ALVEOLI.
Unstable isotopes of xenon that decay or disintegrate emitting radiation. Xe atoms with atomic weights 121-123, 125, 127, 133, 135, 137-145 are radioactive xenon isotopes.
Complete or severe weakness of the muscles of respiration. This condition may be associated with MOTOR NEURON DISEASES; PERIPHERAL NERVE DISEASES; NEUROMUSCULAR JUNCTION DISEASES; SPINAL CORD DISEASES; injury to the PHRENIC NERVE; and other disorders.
The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.
The volume of air that is exhaled by a maximal expiration following a maximal inspiration.
Colloids with a gaseous dispersing phase and either liquid (fog) or solid (smoke) dispersed phase; used in fumigation or in inhalation therapy; may contain propellant agents.
The act of blowing a powder, vapor, or gas into any body cavity for experimental, diagnostic, or therapeutic purposes.
A chronic lung disease developed after OXYGEN INHALATION THERAPY or mechanical ventilation (VENTILATION, MECHANICAL) usually occurring in certain premature infants (INFANT, PREMATURE) or newborn infants with respiratory distress syndrome (RESPIRATORY DISTRESS SYNDROME, NEWBORN). Histologically, it is characterized by the unusual abnormalities of the bronchioles, such as METAPLASIA, decrease in alveolar number, and formation of CYSTS.
A noble gas with the atomic symbol Xe, atomic number 54, and atomic weight 131.30. It is found in the earth's atmosphere and has been used as an anesthetic.
A measure of the amount of WATER VAPOR in the air.
A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures.
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
The extra volume of air that can be expired with maximum effort beyond the level reached at the end of a normal, quiet expiration. Common abbreviation is ERV.
The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat).
The administration of drugs by the respiratory route. It includes insufflation into the respiratory tract.
The act of BREATHING out.
Diseases of the respiratory system in general or unspecified or for a specific respiratory disease not available.
A respiratory distress syndrome in newborn infants, usually premature infants with insufficient PULMONARY SURFACTANTS. The disease is characterized by the formation of a HYALINE-like membrane lining the terminal respiratory airspaces (PULMONARY ALVEOLI) and subsequent collapse of the lung (PULMONARY ATELECTASIS).
Disease having a short and relatively severe course.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
The artificial substitution of heart and lung action as indicated for HEART ARREST resulting from electric shock, DROWNING, respiratory arrest, or other causes. The two major components of cardiopulmonary resuscitation are artificial ventilation (RESPIRATION, ARTIFICIAL) and closed-chest CARDIAC MASSAGE.
Respiratory retention of carbon dioxide. It may be chronic or acute.
Drugs used to induce drowsiness or sleep or to reduce psychological excitement or anxiety.
Evaluation, planning, and use of a range of procedures and airway devices for the maintenance or restoration of a patient's ventilation.
The hospital unit in which patients with respiratory conditions requiring special attention receive intensive medical care and surveillance.
The contamination of indoor air.
Elements that constitute group 18 (formerly the zero group) of the periodic table. They are gases that generally do not react chemically.
Measurement of volume of air inhaled or exhaled by the lung.
An abnormal increase in the amount of oxygen in the tissues and organs.
Difficult or labored breathing.
Examination, therapy or surgery of the interior of the larynx performed with a specially designed endoscope.
Measurement of the volume of gas in the lungs, including that which is trapped in poorly communicating air spaces. It is of particular use in chronic obstructive pulmonary disease and emphysema. (Segen, Dictionary of Modern Medicine, 1992)
The posture of an individual lying face up.
Clinical manifestation consisting of a deficiency of carbon dioxide in arterial blood.
Rhythmic compression of the heart by pressure applied manually over the sternum (closed heart massage) or directly to the heart through an opening in the chest wall (open heart massage). It is done to reinstate and maintain circulation. (Dorland, 28th ed)
A vital statistic measuring or recording the rate of death from any cause in hospitalized populations.
An accumulation of air or gas in the PLEURAL CAVITY, which may occur spontaneously or as a result of trauma or a pathological process. The gas may also be introduced deliberately during PNEUMOTHORAX, ARTIFICIAL.
Infection of the lung often accompanied by inflammation.
Disorders affecting the organs of the thorax.
The removal of secretions, gas or fluid from hollow or tubular organs or cavities by means of a tube and a device that acts on negative pressure.
The architecture, functional design, and construction of hospitals.
Measure of the maximum amount of air that can be expelled in a given number of seconds during a FORCED VITAL CAPACITY determination . It is usually given as FEV followed by a subscript indicating the number of seconds over which the measurement is made, although it is sometimes given as a percentage of forced vital capacity.
A drug-induced depression of consciousness during which patients respond purposefully to verbal commands, either alone or accompanied by light tactile stimulation. No interventions are required to maintain a patent airway. (From: American Society of Anesthesiologists Practice Guidelines)
A condition caused by inhalation of MECONIUM into the LUNG of FETUS or NEWBORN, usually due to vigorous respiratory movements during difficult PARTURITION or respiratory system abnormalities. Meconium aspirate may block small airways leading to difficulties in PULMONARY GAS EXCHANGE and ASPIRATION PNEUMONIA.
A tubular organ of VOICE production. It is located in the anterior neck, superior to the TRACHEA and inferior to the tongue and HYOID BONE.
Surgery performed on the thoracic organs, most commonly the lungs and the heart.
Anesthesia caused by the breathing of anesthetic gases or vapors or by insufflating anesthetic gases or vapors into the respiratory tract.
Introduction of a tube into a hollow organ to restore or maintain patency if obstructed. It is differentiated from CATHETERIZATION in that the insertion of a catheter is usually performed for the introducing or withdrawing of fluids from the body.
Blocking of the PULMONARY ARTERY or one of its branches by an EMBOLUS.
The small thick cartilage that forms the lower and posterior parts of the laryngeal wall.
Continuous care and monitoring of newborn infants with life-threatening conditions, in any setting.
The maximum volume of air that can be inspired after reaching the end of a normal, quiet expiration. It is the sum of the TIDAL VOLUME and the INSPIRATORY RESERVE VOLUME. Common abbreviation is IC.
Expenditure of energy during PHYSICAL ACTIVITY. Intensity of exertion may be measured by rate of OXYGEN CONSUMPTION; HEAT produced, or HEART RATE. Perceived exertion, a psychological measure of exertion, is included.
The presence of bacteria, viruses, and fungi in the air. This term is not restricted to pathogenic organisms.
Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used.
Washing out of the lungs with saline or mucolytic agents for diagnostic or therapeutic purposes. It is very useful in the diagnosis of diffuse pulmonary infiltrates in immunosuppressed patients.
Application of a life support system that circulates the blood through an oxygenating system, which may consist of a pump, a membrane oxygenator, and a heat exchanger. Examples of its use are to assist victims of smoke inhalation injury, respiratory failure, and cardiac failure.
Recording of change in the size of a part as modified by the circulation in it.
A small cluster of chemoreceptive and supporting cells located near the bifurcation of the internal carotid artery. The carotid body, which is richly supplied with fenestrated capillaries, senses the pH, carbon dioxide, and oxygen concentrations in the blood and plays a crucial role in their homeostatic control.
The restoration to life or consciousness of one apparently dead. (Dorland, 27th ed)
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
Endoscopic examination, therapy or surgery of the bronchi.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
Washing liquid obtained from irrigation of the lung, including the BRONCHI and the PULMONARY ALVEOLI. It is generally used to assess biochemical, inflammatory, or infection status of the lung.
Non-therapeutic positive end-expiratory pressure occurring frequently in patients with severe airway obstruction. It can appear with or without the administration of external positive end-expiratory pressure (POSITIVE-PRESSURE RESPIRATION). It presents an important load on the inspiratory muscles which are operating at a mechanical disadvantage due to hyperinflation. Auto-PEEP may cause profound hypotension that should be treated by intravascular volume expansion, increasing the time for expiration, and/or changing from assist mode to intermittent mandatory ventilation mode. (From Harrison's Principles of Internal Medicine, 12th ed, p1127)
Unstable isotopes of nitrogen that decay or disintegrate emitting radiation. N atoms with atomic weights 12, 13, 16, 17, and 18 are radioactive nitrogen isotopes.
The outer margins of the thorax containing SKIN, deep FASCIA; THORACIC VERTEBRAE; RIBS; STERNUM; and MUSCLES.
Devices that cause a liquid or solid to be converted into an aerosol (spray) or a vapor. It is used in drug administration by inhalation, humidification of ambient air, and in certain analytical instruments.
The determination of oxygen-hemoglobin saturation of blood either by withdrawing a sample and passing it through a classical photoelectric oximeter or by electrodes attached to some translucent part of the body like finger, earlobe, or skin fold. It includes non-invasive oxygen monitoring by pulse oximetry.
The motor nerve of the diaphragm. The phrenic nerve fibers originate in the cervical spinal column (mostly C4) and travel through the cervical plexus to the diaphragm.
A sudden intense and continuous aggravation of a state of asthma, marked by dyspnea to the point of exhaustion and collapse and not responding to the usual therapeutic efforts.
The cartilaginous and membranous tube descending from the larynx and branching into the right and left main bronchi.
The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.
The upper part of the trunk between the NECK and the ABDOMEN. It contains the chief organs of the circulatory and respiratory systems. (From Stedman, 25th ed)
Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)
Studies comparing two or more treatments or interventions in which the subjects or patients, upon completion of the course of one treatment, are switched to another. In the case of two treatments, A and B, half the subjects are randomly allocated to receive these in the order A, B and half to receive them in the order B, A. A criticism of this design is that effects of the first treatment may carry over into the period when the second is given. (Last, A Dictionary of Epidemiology, 2d ed)
Developmental or acquired stricture or narrowing of the LARYNX. Symptoms of respiratory difficulty depend on the degree of laryngeal narrowing.
The volume of air contained in the lungs at the end of a maximal inspiration. It is the equivalent to each of the following sums: VITAL CAPACITY plus RESIDUAL VOLUME; INSPIRATORY CAPACITY plus FUNCTIONAL RESIDUAL CAPACITY; TIDAL VOLUME plus INSPIRATORY RESERVE VOLUME plus functional residual capacity; or tidal volume plus inspiratory reserve volume plus EXPIRATORY RESERVE VOLUME plus residual volume.
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
The application of heat to raise the temperature of the environment, ambient or local, or the systems for accomplishing this effect. It is distinguished from HEAT, the physical property and principle of physics.
Three-dimensional representation to show anatomic structures. Models may be used in place of intact animals or organisms for teaching, practice, and study.
Hospital units providing continuing surveillance and care to acutely ill newborn infants.
Gases or volatile liquids that vary in the rate at which they induce anesthesia; potency; the degree of circulation, respiratory, or neuromuscular depression they produce; and analgesic effects. Inhalation anesthetics have advantages over intravenous agents in that the depth of anesthesia can be changed rapidly by altering the inhaled concentration. Because of their rapid elimination, any postoperative respiratory depression is of relatively short duration. (From AMA Drug Evaluations Annual, 1994, p173)
The technology of transmitting light over long distances through strands of glass or other transparent material.
A gamma-emitting radionuclide imaging agent used for the diagnosis of diseases in many tissues, particularly in cardiovascular and cerebral circulation.
Community health and NURSING SERVICES providing coordinated multiple services to the patient at the patient's homes. These home-care services are provided by a visiting nurse, home health agencies, HOSPITALS, or organized community groups using professional staff for care delivery. It differs from HOME NURSING which is provided by non-professionals.
The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)
Cessation of heart beat or MYOCARDIAL CONTRACTION. If it is treated within a few minutes, heart arrest can be reversed in most cases to normal cardiac rhythm and effective circulation.
Imaging methods that result in sharp images of objects located on a chosen plane and blurred images located above or below the plane.
A type of lung inflammation resulting from the aspiration of food, liquid, or gastric contents into the upper RESPIRATORY TRACT.
Air pollutants found in the work area. They are usually produced by the specific nature of the occupation.
Stable xenon atoms that have the same atomic number as the element xenon, but differ in atomic weight. Xe-124, 126, 128-131, 134, and 136 are stable xenon isotopes.
The position or attitude of the body.
Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.
Process of administering an anesthetic through injection directly into the bloodstream.
A central respiratory stimulant with a brief duration of action. (From Martindale, The Extra Pharmocopoeia, 30th ed, p1225)
An infant whose weight at birth is less than 1500 grams (3.3 lbs), regardless of gestational age.
A class of statistical methods applicable to a large set of probability distributions used to test for correlation, location, independence, etc. In most nonparametric statistical tests, the original scores or observations are replaced by another variable containing less information. An important class of nonparametric tests employs the ordinal properties of the data. Another class of tests uses information about whether an observation is above or below some fixed value such as the median, and a third class is based on the frequency of the occurrence of runs in the data. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1284; Corsini, Concise Encyclopedia of Psychology, 1987, p764-5)
The age of the conceptus, beginning from the time of FERTILIZATION. In clinical obstetrics, the gestational age is often estimated as the time from the last day of the last MENSTRUATION which is about 2 weeks before OVULATION and fertilization.
That portion of the body that lies between the THORAX and the PELVIS.
A respiratory support system used to remove mucus and clear airway by oscillating pressure on the chest.
All-purpose surfactant, wetting agent, and solubilizer used in the drug, cosmetics, and food industries. It has also been used in laxatives and as cerumenolytics. It is usually administered as either the calcium, potassium, or sodium salt.

Modeling breathing-zone concentrations of airborne contaminants generated during compressed air spray painting. (1/417)

This paper presents a mathematical model to predict breathing-zone concentrations of airborne contaminants generated during compressed air spray painting in cross-flow ventilated booths. The model focuses on characterizing the generation and transport of overspray mist. It extends previous work on conventional spray guns to include exposures generated by HVLP guns. Dimensional analysis and scale model wind-tunnel studies are employed using non-volatile oils, instead of paint, to produce empirical equations for estimating exposure to total mass. Results indicate that a dimensionless breathing zone concentration is a nonlinear function of the ratio of momentum flux of air from the spray gun to the momentum flux of air passing through the projected area of the worker's body. The orientation of the spraying operation within the booth is also very significant. The exposure model requires an estimate of the contaminant generation rate, which is approximated by a simple impactor model. The results represent an initial step in the construction of more realistic models capable of predicting exposure as a mathematical function of the governing parameters.  (+info)

Mathematical models for predicting indoor air quality from smoking activity. (2/417)

Much progress has been made over four decades in developing, testing, and evaluating the performance of mathematical models for predicting pollutant concentrations from smoking in indoor settings. Although largely overlooked by the regulatory community, these models provide regulators and risk assessors with practical tools for quantitatively estimating the exposure level that people receive indoors for a given level of smoking activity. This article reviews the development of the mass balance model and its application to predicting indoor pollutant concentrations from cigarette smoke and derives the time-averaged version of the model from the basic laws of conservation of mass. A simple table is provided of computed respirable particulate concentrations for any indoor location for which the active smoking count, volume, and concentration decay rate (deposition rate combined with air exchange rate) are known. Using the indoor ventilatory air exchange rate causes slightly higher indoor concentrations and therefore errs on the side of protecting health, since it excludes particle deposition effects, whereas using the observed particle decay rate gives a more accurate prediction of indoor concentrations. This table permits easy comparisons of indoor concentrations with air quality guidelines and indoor standards for different combinations of active smoking counts and air exchange rates. The published literature on mathematical models of environmental tobacco smoke also is reviewed and indicates that these models generally give good agreement between predicted concentrations and actual indoor measurements.  (+info)

Effect of temperature on lung function and symptoms in chronic obstructive pulmonary disease. (3/417)

The present study investigated whether falls in environmental temperature increase morbidity from chronic obstructive pulmonary disease (COPD). Daily lung function and symptom data were collected over 12 months from 76 COPD patients living in East London and related to outdoor and bedroom temperature. Questionnaires were administered which asked primarily about the nature of night-time heating. A fall in outdoor or bedroom temperature was associated with increased frequency of exacerbation, and decline in lung function, irrespective of whether periods of exacerbation were excluded. Forced expiratory volume in one second (FEV1) and forced vital capacity (FVC) fell markedly by a median of 45 mL (95% percentile range: -113-229 mL) and 74 mL (-454-991 mL), respectively, between the warmest and coolest week of the study. The questionnaire revealed that 10% had bedrooms <13 degrees C for 25% of the year, possibly because only 21% heated their bedrooms and 48% kept their windows open in November. Temperature-related reduction in lung function, and increase in exacerbations may contribute to the high level of cold-related morbidity from chronic obstructive pulmonary disease.  (+info)

A 15-week experimental exposure of pigs to airborne dust with added endotoxin in a continuous flow exposure chamber. (4/417)

The purpose of this study was to evaluate the effect of longterm exposure to airborne dust and endotoxin on the respiratory system of pigs. A continuous flow exposure chamber was built for the purpose of exposing pigs to selected airborne contaminants. Pigs (n = 6) were exposed to a combination of a very fine corn/soybean meal (40.6 mg/m3) with added lipopolysaccharide (LPS; 12.4 microg/m3) for 8 h/d over 5 d for 15 wk (75 d of exposure). Control pigs (n = 6) were housed in a room with minimal contamination of these airborne contaminants. Surprisingly, dust in the exposure chamber and the control room was highly contaminated with peptidoglycan. Changes in the lung were monitored by collecting bronchoalveolar lavage (BAL) fluid for cytology at 5 different time points throughout the exposure period. Blood samples were collected at the same time for hematology. A non-specific respiratory inflammatory response was found in exposed and control pigs, as suggested by the increased neutrophils in BAL fluid and the small inflammatory areas in the lung tissue. No macroscopic lung lesions were observed in control or exposed pigs. The findings in the control pigs imply that even low dust concentrations and possibly peptidoglycan contamination can induce cellular changes in the BAL fluid and that a true control pig does not exist. In addition, the exposed pigs developed a mild eosinophilia, indicating an allergic response to the airborne contaminants.  (+info)

Buildings operations and ETS exposure. (5/417)

Mechanical systems are used in buildings to provide conditioned air, dissipate thermal loads, dilute contaminants, and maintain pressure differences. The characteristics of these systems and their operations h implications for the exposures of workers to environmental tobacco smoke (ETS) and for the control of these exposures. This review describes the general features of building ventilation systems and the efficacy of ventilation for controlling contaminant concentrations. Ventilation can reduce the concentration of ETS through dilution, but central heating, ventilating, and air conditioning (HVAC) can also move air throughout a building that has been contaminated by ETS. An understanding of HVAC systems is needed to develop models for exposures of workers to ETS.  (+info)

Effects of aqueous extracts of PM(10) filters from the Utah valley on human airway epithelial cells. (6/417)

We hypothesized that the reduction in hospital respiratory admissions in the Utah Valley during closure of a local steel mill in 1986-1987 was attributable in part to decreased toxicity of ambient air particles. Sampling filters for particulate matter < 10 micrometer (PM(10)) were obtained from a Utah Valley monitoring station for the year before (year 1), during (year 2), and after (year 3) the steel mill closure. Aqueous extracts of the filters were analyzed for metal content and oxidant production and added to cultures of human respiratory epithelial (BEAS-2B) cells for 2 or 24 h. Year 2 dust contained the lowest concentrations of soluble iron, copper, and zinc and showed the least oxidant generation. Only dust from year 3 caused cytotoxicity (by microscopy and lactate dehydrogenase release) at 500 microgram/ml. Year 1 and year 3, but not year 2, dust induced expression of interleukin-6 and -8 in a dose-response fashion. The effects of ambient air particles on human respiratory epithelial cells vary significantly with time and metal concentrations.  (+info)

Airborne infection in a fully air-conditioned hospital. II. Transport of gaseous and airborne particulate material along ventilated passageways. (7/417)

A mathematical model is described for the transport of gaseous or airborne particulate material between rooms along ventilated passageways. Experimental observations in three hospitals lead to a value of about 0.06 m.2/sec. for the effective diffusion constant in air without any systematic directional flow. The 'constant' appears to increase if there is any directional flow along the passage, reaching about 0.12 m. 2/sec. at a flow velocity of 0.04 m./sec. Together with previously published methods the present formulae make it possible to calculate the expected average amounts of gaseous or particulate material that will be transported from room to room in ventilated buildings in which the ventilation and exchange airflows can be calculated. The actual amounts transported in occupied buildings, however, vary greatly from time to time.  (+info)

Office equipment and supplies: a modern occupational health concern? (8/417)

The Helsinki Office Environment Study, a population-based cross-sectional study was carried out in Finland in 1991 among 2,678 workers in 41 randomly selected office buildings. The aim was to evaluate the relations between work with office equipment and supplies and the occurrence of eye, nasopharyngeal, skin, and general symptoms (often denoted as sick building syndrome (SBS)), chronic respiratory symptoms, and respiratory infections. Work with self-copying paper was significantly related to weekly work-related eye, nasopharyngeal, and skin symptoms, headache and lethargy, as well as to the occurrence of wheezing, cough, mucus production, sinusitis, and acute bronchitis. Photocopying was related to nasal irritation, and video display terminal work to eye symptoms, headache, and lethargy.  (+info)

Exhaust ventilation systems operate by pulling outside air into the home. An exhaust ventilation system is the simplest of whole-house ventilation systems, as they can function with a single exhaust fan. Some exhaust ventilation systems also include ducts, but they arent necessary for operation.. There are a variety of exhaust ventilation configurations in use, but all exhaust systems create negative pressure inside the home. Negative pressure occurs whenever the outside air pressure exceeds that of the homes interior.. As a result of negative pressure, fresh air is pulled into the home through any openings between the exterior and interior of the structure, while stale air is blown out of the exhaust fan. Optionally, an exhaust ventilation system may be equipped with installed intake vents that permit more air to enter the home. However, if the openings are too large, air movement may be negatively affected, so this feature is often omitted from exhaust ventilation systems.. Exhaust ...
Apart from ventilation system A (which was added at the request of housing associations because they represent a significant share of the housing stock) all other ventilation systems are code compliant. The large variations both in CO2-excess dose per person and in the standard deviation illustrate that there are considerable differences in the IAQ-performance of code compliant ventilation systems. The large extent of these differences in achieved air exchange rates was not fully anticipated, especially given the fact that all ventilation systems achieved overall air exchange rates well above 10 l/s per person, which complies with the highest IAQ category (prEN 16798-1:2015) . The data in fact illustrates to what extent the ventilation systems are capable of achieving the requested air exchange rates per person in the various habitable rooms. Ventilation systems that apply a mechanical component in the air exchange provisions in habitable rooms (either supply, exhaust or both) perform ...
How often does your exhaust system need service?. Depending upon the geographic location of your vehicle, exhaust systems may or may not need frequent attention. Typically, the exhaust system in a car does not need much attention until higher mileage or advanced years. Most cars do not need any exhaust work for upwards of 8 to 10 years due to the corrosion resistant, stainless steel used in exhaust systems installed in the factory. However, repairs will become more common and more expensive as components age and develop holes and leaks or when they fail completely.. What are the symptoms of a faulty exhaust system?. A louder sounding exhaust is the easiest symptom to identify, and a technician can easily point out where the leak exists when the car is on a lift. The prime culprits for leaking are the flexible weave near the front of the exhaust, and the union where two flanges are bolted together. The flexible weave allows for the exhaust system to move around when the car twists and turns. It ...
How often does your exhaust system need service?. Depending upon the geographic location of your vehicle, exhaust systems may or may not need frequent attention. Typically, the exhaust system in a car does not need much attention until higher mileage or advanced years. Most cars do not need any exhaust work for upwards of 8 to 10 years due to the corrosion resistant, stainless steel used in exhaust systems installed in the factory. However, repairs will become more common and more expensive as components age and develop holes and leaks or when they fail completely.. What are the symptoms of a faulty exhaust system?. A louder sounding exhaust is the easiest symptom to identify, and a technician can easily point out where the leak exists when the car is on a lift. The prime culprits for leaking are the flexible weave near the front of the exhaust, and the union where two flanges are bolted together. The flexible weave allows for the exhaust system to move around when the car twists and turns. It ...
This document describes the advantages of using Mobility transfer function simulations during the development of exhaust systems. The automotive industry demands increasingly stringent levels of acceptable interior noise. The exhaust system is an important contributor to the total vehicle noise and vibration and thus is a target for noise reduction. The use of good vibration isolation systems makes it possible to decrease noise in the vehicle interior compartment. In other words, the vibratory motion in automotive structures results in tactile and acoustic responses. This occurs when the energy coming from the engine (source) is transferred by the Exhaust System (path) and then is transformed into Structural Borne Noise received by the Driver (receiver) through the hanging arrangement of the Exhaust System. In this paper, a procedure to apply the Mobility transfer function to exhaust system design is first described and then an example of correlation results between experimental tests and finite ...
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Virtual validation of the dynamic performance of exhaust systems with measured vehicle loads is being used increasingly by many OEMs and exhaust system suppliers. The loads induced due to power train roll motion, the vibration characteristic from the ground and power train system are collected during the RLDA (Road Load Data Acquisition). Modal transient dynamic analysis is carried out using FEA with input loading from the full event RLDA to predict the behavior of the system. The key performance measures that are studied in this work are the force transmitted by the exhaust system to the vehicle body and the damage at the critical joints. There are many design variables that could impact the dynamic response of the system like the choice of the isolator, the thickness of the parts, the weld characteristics of joints etc. Inherent variability in the vibration data obtained during RLDA could also influence the behavior of the exhaust system. All the above parameters are analyzed using a DOE ...
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Mechanical ventilation is an important life support treatment of critically ill patients, and air pressure dynamics of human lung affect ventilation treatment effects. In this paper, in order to obtain the influences of seven key parameters of mechanical ventilation system on the pressure dynamics of human lung, firstly, mechanical ventilation system was considered as a pure pneumatic system, and then its mathematical model was set up. Furthermore, to verify the mathematical model, a prototype mechanical ventilation system of a lung simulator was proposed for experimental study. Last, simulation and experimental studies on the air flow dynamic of the mechanical ventilation system were done, and then the pressure dynamic characteristics of the mechanical system were obtained. The study can be referred to in the pulmonary diagnostics, treatment, and design of various medical devices or diagnostic systems.
Summer is a season characterized by people leaving their houses and going on short vacations to unwind. Families usually visit a beach during their vacation in order to spend their time under the sun and forget some of their problems, which might include their homes poor ventilation system. Family members, especially those who rarely use the attic, could easily disregard the effect of a poor ventilation system to a houses roof.. There are five common roofing problems that stem down from a poor ventilation system. The one fool-proof way to avoid all of these is to ensure a proper ventilation system is installed in your house. Check out the list to see if a problem started or is already manifested in your house.. ...
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Provides an air sampling and consultancy service covering mainstream occupational hygiene practice mainly to clients in a broad range of manufacturing industry. Main areas of work are the assessment of exposure to noise, dust, fumes, gases and bio-aerosols, together with the testing of local exhaust ventilation systems. Own laboratory facilities include gravimetry, gas chromatography and colorimetric methods.. This company also provides the following services: ...
This project is mainly focused on the improving and design of the ventilation system of two rooms at different levels of a gym (Friskis and Svettis in Gävle, Sweden) to reduce the concentration to never be higher than 1000 ppm.. For this purpose, several field measurements were performed in different locations and situations. Two main measurements were necessary. On one hand, the level in different parts of the rooms during different activities. On the other hand, the air flow through the inlet and outlet ducts of the ventilation system. It was also important to take into account the indoor temperature and humidity. These measurements were enough to analyze the failures of the system and to recognize the worst points of each room.. Comparing both rooms, the necessity of changing the ventilation system in one of these rooms was much higher, due to there were measured values up to 3000 ppm during a typical day in the gym.. With this information the consequences of high CO2 levels in human people ...
Even during the current epidemic, duty-holders still have a legal responsibility to maintain work equipment and carry out thorough examinations, written schemes and Statutory Inspections. These legal duties exist to help manage the significant hazard that the failure of such equipment can pose. Not complying with these duties can significantly increase the risk of harm to workers and members of the public. The Health and Safety Executive (HSE) is not considering issuing exemptions or relaxation of these requirements. HSE state that even if businesses are currently closed to meet COVID-19 related government advice or restrictions, access should still be given to inspectors to undertake thorough examinations.. Our Occupational Hygiene team are well placed to support you to ensure the reopening of your establishment is a safe and healthy one. To understand how we can support you visit our Local exhaust ventilation testing and inspection page. ...
GU group seminar programme: dealing with all aspects of the current standards, directives, certifications, the latest architectural trends and industry-relevant topics.
This leaflet is for employers to help them buy the right type of local exhaust ventilation (LEV) for their workplace. It tells them how to choose a supplier, what documentation is required, and how to check, use and maintain it properly.
ILEVE has been established to promote air quality in the workplace and to reduce ill health and death due to airborne contamination and hazardous substances in the working environment.
Introduction. Nike is good: A factory called Samyang in Vietnam (a factory under Nike contract) seems to be keeping satisfactory working levels within the building. It employs 5,200 people, most of them being women. The factory is made up of six big buildings with well-kept surroundings. Inside, there are fans keeping the workers cool, fire extinguishers about in the case of an emergency, and workers can easily access goggles, masks and gloves if they need them. Workers get double the local average of $54 per month and an annual bonus of at least one months salary. Other factories get a lot less - in rural areas, factories pay $35 per month, in suburbs they pay $40 per month, and in cities, $45 per month. ...read more. Middle. The investigator found that Nike had indeed replaced the compound and had also installed local exhaust ventilation systems. They also discovered that Nike had trained certain staff personnel aspects of health and safety. Nike is bad: Nike does not own the factories their ...
TY - JOUR. T1 - Calculation methods for single-sided natural ventilation. T2 - Now and ahead. AU - Larsen, Tine Steen. AU - Plesner, Christoffer. AU - Leprince, Valérie. AU - Carrié, François Rémi. AU - Bejder, Anne Kirkegaard. PY - 2018/10/15. Y1 - 2018/10/15. N2 - In order to reduce the energy consumption for cooling in our buildings, the use of passive cooling solutions is necessary. One of these solutions is natural ventilative cooling, where airflows generated by single-sided natural ventilation, until today have mainly been calculated from the De Gids & Phaff equation in the European Standard EN 15242:2007. In the revised standard EN 16798-7:2017, a new version of the equation for single-sided natural ventilation is released. The work in this paper will compare the results from the new equation with earlier equations for single-sided ventilation and hold them up against wind-tunnel measurements, full-scale measurements and CONTAM calculations to clarify whether and why the new equation ...
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The goal of this project was to improve the quality of indoor air in a multistoried residentialbuilding of 81 flats built in 1960. The building is located in a heavily built urban area ofHelsinki. The building had a mechanical exhaust ventilation system without outdoor air inlets.A questionnaire was sent to occupants and a condition survey was made prior to renovation. Themain
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Keeping your house cool and comfortable without impacting on the air quality can be challenging, especially in summer. While artificial methods of ventilation such as AC systems and fans have become increasingly popular over the last years, these have some downsides that are worth considering before picking a ventilation system for your hose.. Natural ventilation, instead, can reduce your energy consumption and leverage the force of nature to keep your living environment comfortable and ventilated. Strategically-placed openings in a building can encourage natural movements of wind without the need for mechanical means.. At its very core, natural ventilation works by making the most out of the difference in pressure created between the outside and the inside of your house by air temperature and wind. In turn, this airflow can decrease and increase the internal temperature and provide a suitable and enjoyable environment. ...
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China paper workshop ventilation equipment manufacturer. This ventilation equipment is mainly used in paper workshop, or paper mills.We provide clients worldwide with various kinds of ventilation system, as well as manufacture and installation of pipes. Our machines mainly include: dehumidification system of wire section, air supply system of wet suspended ceiling, air supply system of drying and finishing sections, and air supply system of workshop.
This paper presents a new concept of ventilation system for residential building, based on a hybrid ventilation system, mainly control by weather conditions and IAQ sensors to optimize exhaust airflows rates, for the purpose of improving global building energy performance and improving the quality of life of the occupiers.
Figure 2. Lines of Equal Carbon Dioxide Concentrations on a Room Plan with Displacement Ventilation Installed (A) and in a Stream of Incoming Fresh Air (B).. The efficiency of ventilation systems can also be characterized by the lifetime of fresh air - the time that air flowing from the air distributor takes to reach the breathing area. In personal ventilation system it takes less than a second; in displacement systems, 20 to 30 seconds, and in short circuit systems, up to ten minutes.. The efficiency retention of the air distribution system can thus be considered the criteria of the adaptability of ventilation systems (DCV systems). Demand Controlled Ventilation (DCV) stands for a special type of variable air velocity (VAV) ventilation systems that permit wide-range control of air exchange in individual areas and at different times depending on the actual occupancy of the premises [12, 13, 14, 15,16].. Another adaptability criterion should be the correspondence between the amount of the ...
Ideal for tightly sealed homes, Lennox ® whole-home Healthy Climate® ventilations systems replace stale indoor air with clean outdoor air, making your home feel fresher and less stuffy. Better than opening a window, which can let allergens and bugs into your home, a Healthy Climate ventilation system allows you to easily and efficiently control the amount of fresh air coming into your home.. Ask For Quote Details ...
MINNEAPOLIS, Sept. 23, 2010 Honeywell (NYSE: HON) today introduced TrueBREEZE™, a balanced ventilation system that simplifies hanging and duct connections, and balances without adjusting dampers.The compact, lightweight design and adjustable hanging straps of TrueBREEZE make it easy to raise, lower and level the unit into place. The removable duct collars allow contractors to easily connect ductwork away from the unit. Two variable-speed motors, one for each air stream, work with the integrated speed control to balance the system.Contractors are looking for products that simplify installation, said John Tyhacz, vice president and general manger for Honeywells Home Comfort and Energy Systems business. TrueBREEZE Balanced Ventilation Systems eliminate the need for overhead ducting and balance without adjusting dampers, significantly reducing and simplifying installation time.Along with the timesaving installation and simplified balancing, TrueBREEZE offers an array of other benefits, ...
In this thesis, fires in road tunnels with longitudinal and transverse ventilation systems are investigated numerically and experimentally. The fire smoke is simulated as a buoyant plume obtained by injecting a mixture of air and helium into ambient air. With this simplified representation, the radiation and the heat losses at the walls are not taken into account, but the model can nevertheless provide relevant information on phenomenology and data fields that can be compared to real fires. The study aims to meet various objectives, in particular increasing the efficiency of the mechanical ventilation systems and improving the safety of tunnels users in the event of fires. In the first part, experiments are conducted to measure, using Particle Image Velocimetry (PIV) system, the velocity fields induced by turbulent buoyant plumes released within a longitudinally ventilated tunnel. The aim is to study the non-Boussinesq effects (i.e. effects related to large density differences between the buoyant plume
Global Commercial Kitchen Ventilation Systems Market 2019. Commercial Kitchen Ventilation Systems Market Size by Types, Applications, Major Regions and Major Manufacturers including the capacity, production, price, revenue, cost, gross margin, sales volume, sales revenue, consumption, growth rate, import, export, supply, future strategies.
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For the ultimate smoke ventilation system, these Fakro centre-pivot smoke ventilation systems are a worthwhile investment for your property. Each window co...
As the days go from cool to cold and the last leaves fall from the trees, its time to admit it. Yes, winter is coming. Its not even the snow and ice that most of us mind so much, its the stale, cooped-up atmosphere indoors. Thats why many homeowners are looking for a good ventilation system, to get nice fresh air without opening a window when its 10 or 20 below outside. You may have heard of whole-house ventilation systems - HRV (heat recovery
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IOM carry out ventilation system testing, providing validation and specialised annual verification services for hospital ventilation systems.
A building which is well insulated and sufficiently air tight to be energy efficient will generally need some kind of ventilation system to provide fresh air and control moisture. In the past, buildings were ventilated through uncontrolled air movement and infiltration through small cracks and holes in the building envelope, but in energy efficient buildings, those small cracks and holes dont exist. Some ventilation can be achieved by opening windows and doors, especially with the addition of passive solar ventilation, whole house fans and other spot ventilation. When a central heating or cooling system is in use, however, it would be counterproductive to use any of those ventilation strategies, and some form of whole-house ventilation would be more appropriate. Exhaust Ventilation Systems work by decreasing the air pressure inside of a building, causing indoor air to leave the building, while outside air enters the building through leaks in the building shell and intentional passive vents. ...
Do You Have Sick Building Syndrome? Join friendly people sharing true stories in the I Have Sick Building Syndrome group. Find support forums, advice and chat with groups who share this life experience. Sick Building Syndrome anonymous support group ...
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In the late 1970s, it was noted that nonspecific symptoms were reported by tenants in newly constructed homes, offices, and nurseries. In media it was called office illness. The term Sick Building Syndrome was coined by the WHO in 1986, when they also estimated that 10-30% of newly built office buildings in the West had indoor air problems. Early Danish and British studies reported symptoms.. Poor indoor environments attracted attention. The Swedish allergy study (SOU 1989:76) designated sick building as a cause of the allergy epidemic as was feared. In the 1990s, therefore, extensive research into sick building was carried out. Various physical and chemical factors in the buildings were examined on a broad front.. The problem was highlighted increasingly in media and was described as a ticking time bomb. Many studies were performed in individual buildings.. In the 1990s sick buildings were contrasted against healthy buildings. The chemical contents of building materials were ...
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Call to Comment on EU Cleanliness of Ventilation Systems Draft Standard. Draft European Standard prEN 15780: Ventilation for buildings - Ductwork - Cleanliness of ventilation systems is out for public comment. It has the potential to ensure clean, safe air conditioning systems throughout the European Union. - PR10090931
Sick building syndrome is a combination of ailments associated with an individuals place of work or residence. It is mostly related to poor indoor air quality.
Learn more about Improved Ventilation System for Removal of Airborne Contamination in Airborne Infectious Isolation Rooms at ashrae.org
A discussion of the Sick Building Syndrome was presented by Jan Stolwijk, (Epidemiologist) Yale University School of Medicine, and member, National Academy of Sciences Committee on Indoor Air Pollution and ASHRAE Standards Committee. He identified the sick building syndrome (a fictitious problem circulated by the tobacco industry) and addressed ventilation rates and the new ASHRAE standards. According to him, the new standard will outline procedures for greater accountability for-each phase of a buildings development. For example, an architects design assumptions are to be transferred to the building owner by means of a permanent document. Stolwijk mentioned that ASHRAEs committee included representatives from the Tobacco Institute and the Formaldehyde Institute to protect their interests. in the past, he said, ASHRAE was threatened with lawsuits by TI and the Formaldehyde Institute concerning the ventilation standard. The new ASHRAE standards, according to Stolwijk, will be 15 cfm/person ...
The idea that a building could make people ill has been in the public consciousness since 1976 when Legionella pneumophila first reared its ugly bacterial head at an American Legion convention in Philadelphia. While that was an unusual and isolated case, the idea of a buildings indoor air causing illness has never gone away.. During the eighties and nineties we embraced energy efficiencies with such vigor that in some cases our buildings became airtight breeding grounds for germs and toxins and building occupants experienced symptoms of acute discomfort.. In addition, according to the EPA, we here in North America spend as much as 90 percent of our time inside our buildings - our homes included - and these buildings are responsible for 38.9 percent of the US carbon dioxide emissions.. Although the actual figure is difficult to determine, the EPA has estimated the losses in employee absenteeism, medical costs, reduced productivity, and lower earnings due to sick building syndrome to be anywhere ...
Are there any occupants in your building that experience acute unexplained health conditions? Learn about sick building syndrome and find out what may be causing these unspecific illnesses
Sick building syndrome (SBS) is a set of symptoms you get while youre in a particular building. It usually happens in an office, but you can get it in any building.
If you experience health problems in your home or workplace, and the symptoms have no apparent cause, you may be suffering from sick building syndrome.
No person may enter a permit required confined space without a confined space entry permit. Entry into non-permitted confined spaces can be made as long as the special procedures for entry into that space are followed. Contractors are responsible for their employees during work in confined spaces. This policy is meant to apply to all employees, contractors, inspectors, and all other persons entering an identified confined space at San Diego State University. Please contact EHS for further information. ...
Outdoor air enters and leaves a house by: infiltration, natural ventilation, and mechanical ventilation. In a process known as infiltration, outdoor air flows into the house through openings, joints, and cracks in walls, floors, and ceilings, and around windows and doors. In natural ventilation, air moves through opened windows and doors. Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind. Finally, there are a number of mechanical ventilation devices, from outdoor-vented fans that intermittently remove air from a single room, such as bathrooms and kitchen, to air handling systems that use fans and duct work to continuously remove indoor air and distribute filtered and conditioned outdoor air to strategic points throughout the house. The rate at which outdoor air replaces indoor air is described as the air exchange rate. When there is little infiltration, natural ventilation, or mechanical ...
This is an emerging illness, with complaints stemming from construction practices that began in the 1970s. Health complaints may be transient or become chronic, in some cases.. Sick building research shows that building-related symptoms are associated with building characteristics including dampness, cleanliness, and ventilation (NIOSH). Causes are frequently pinned down to flaws in the heating, ventilation, and air conditioning (HVAC) systems. Other causes have been attributed to contaminants produced by outgassing of some types of building materials, volatile organic compounds, molds (see mold health issues), improper exhaust ventilation of light industrial chemicals used within, location of fresh-air intake, or lack of adequate air filtration (see Minimum Efficiency Reporting Value).. Symptoms are often dealt with after-the-fact by boosting the overall turnover rate of fresh air exchange with outside air, but the new green building design goal should be to avoid most of the SBS problem ...
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An appliance is provided for installation within the mouth of an individual to prevent obstruction of the natural airway of the individual and to enhance natural ventilation during sleep. The appliance is hollow and constructed of material which is custom-molded to the user. An external negative air supply is provided which connects to a tube extending from the appliance and draws air from the hollow appliance creating a partial vacuum in the users retroglossal area urging the users tongue and soft palate away from the users posterior pharyngeal wall and thereby opening an airway to the users nasal cavity. A sensor provides control information to the negative air supply by sensing relative pressure in the users oral cavity. The natural breathing cycle is thus facilitated but not controlled by the appliance.
An appliance is provided for installation within the mouth of an individual to prevent obstruction of the natural airway of the individual and to enhance natural ventilation during sleep. The appliance is hollow and constructed of material which is custom-molded to the user. An external negative air supply is provided which connects to a tube extending from the appliance and draws air from the hollow appliance creating a partial vacuum in the users retroglossal area urging the users tongue and soft palate away from the users posterior pharyngeal wall and thereby opening an airway to the users nasal cavity. A sensor provides control information to the negative air supply by sensing relative pressure in the users oral cavity. The natural breathing cycle is thus facilitated but not controlled by the appliance.
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Choosing a fume hood is not an easy task. One way to make it easier is by narrowing down the choices by knowing what processes the fume hood will facilitate. It also helps to know how much room is available in the lab for the hood.. Knowing the types of chemicals being used can make selecting the proper hood a simple process. Meet with a sales representative from several manufacturers of fume hoods to get an exact chemical assessment done before viewing the selection of hoods compatible with various solvents, chemicals, and acids. Once the assessment has been completed, it makes choosing a ducted fume hood versus a ductless one a more obvious choice. These are the two basic types of fume hoods available.. In addition to choosing the hood to match the work being done in the lab, consider where to place the unit. It has to be placed away from doorways and air conditioners in order to safely remove toxins, dust and particulates from the air. Knowing where to position it helps narrow down the choice ...
Indoor Air Quality (IAQ) problems are not limited to just homes. In fact, many office buildings have a wider variety of air pollution sources, such as office equipment, printing/copying, and industrial chemicals. Some of these buildings may be inadequately ventilated or mechanical ventilation systems may not be designed or operated to provide adequate amounts of outdoor air. In addition, sometimes external sources of pollutants like wildfires are beyond our control and systems are not adequately designed to handle these extreme cases. Finally, people generally have less control over the indoor environment in their offices than they do in their homes. As a result, there has been an increase in the incidence of reported health problems due to poor indoor air quality, which impacts employee productivity.. Examples of office air pollutants include gases and particles produced by tobacco smoking, those released by molds and bacteria that grow indoors on damp surfaces, and the volatile organic ...
Indoor Air Quality (IAQ) problems are not limited to just homes. In fact, many office buildings have a wider variety of air pollution sources, such as office equipment, printing/copying, and industrial chemicals. Some of these buildings may be inadequately ventilated or mechanical ventilation systems may not be designed or operated to provide adequate amounts of outdoor air. In addition, sometimes external sources of pollutants like wildfires are beyond our control and systems are not adequately designed to handle these extreme cases. Finally, people generally have less control over the indoor environment in their offices than they do in their homes. As a result, there has been an increase in the incidence of reported health problems due to poor indoor air quality, which impacts employee productivity.. Examples of office air pollutants include gases and particles produced by tobacco smoking, those released by molds and bacteria that grow indoors on damp surfaces, and the volatile organic ...
Indoor Air Quality (IAQ) problems are not limited to just homes. In fact, many office buildings have a wider variety of air pollution sources, such as office equipment, printing/copying, and industrial chemicals. Some of these buildings may be inadequately ventilated or mechanical ventilation systems may not be designed or operated to provide adequate amounts of outdoor air. In addition, sometimes external sources of pollutants like wildfires are beyond our control and systems are not adequately designed to handle these extreme cases. Finally, people generally have less control over the indoor environment in their offices than they do in their homes. As a result, there has been an increase in the incidence of reported health problems due to poor indoor air quality, which impacts employee productivity.. Examples of office air pollutants include gases and particles produced by tobacco smoking, those released by molds and bacteria that grow indoors on damp surfaces, and the volatile organic ...
Indoor air quality assessments usually begin by conducting a visual inspection to identify areas/equipment that may be sources of pollutants, then determine their correlation with existing ventilation systems. Areas of potentially high pollutant concentrations are identified and air sampler units are installed. Air samples are analyzed for quantitative results of pollutant concentrations and evaluated to determine if there is a potential threat to health or the environment. Although Ontario does not have legislation that deals with indoor air quality, there are guidelines published by Health Canada, the Occupational Safety and Health Act(OSHA) and by the National Institute for Occupational Safety and Health (NIOSH). Comco Canada Inc. uses the standards published in these guidelines as well as best practices when conducting indoor air quality assessments.. ...
What causes Sick Building Syndrome?. Sick Building Syndrome is not an actual disease but rather a series of symptoms affecting people who spend long hours in closed spaces. The symptoms were first described in the United States around the mid-1970s, when major energy-saving measures led to the construction of air-tight office buildings made out of materials that used questionable chemicals and managed by centrally controlled HVAC systems Sick Building Syndrome is associated with the typical symptoms of acute intoxication caused by environmental pollutants.. Best practices: how important is temperature and humidity control in our homes?. Opening the windows even just for a few minutes every day will help keep homes healthy and prevent the build-up of mould and fungi. Installing a simple hygrometer in the home can also measure the moisture content in the home, for instance after cooking, bathing or hanging laundry to dry indoors. Its time to replace doors and windows when the hygrometer ...
When it comes to cleaning and restoration methods following a fire event, it is imperative that all HVAC and ventilation systems be addressed. In addition to heating and cooling systems, restorers must also pay special attention to other ventilation mechanisms, including those like exhaust ducts and filters in kitchens. Moreover, remediators must move and clean behind, around and under appliances, and must clean the exterior and interior of vent hood filters, mounting cavities and subsurface areas. Bathroom vents will also need to be addressed. Common HVAC heating and cooling systems come in various types. No matter the variety, these systems will need to be cleaned thoroughly following a fire, particularly if they were in operation during or immediately following the fire event. As far as ease of cleaning, there are certain HVAC systems that are easier to clean than others. Metal ducts, for example, are the easiest for remediators to restore. Vinyl ducts, on the other hand, are much more ...
Best DDEXSS T Inch Downdraft Ventilation System with Multiple Blower Options, 3 Speed Push Button Electronic Control, and Dishwasher Safe Mesh Filters: Stainless Steel
Greenheck Fan Corporation, a supplier of commercial and industrial ventilation systems, will invest $10.3 million to expand its manufacturing facility in Kings Mountain, North Carolina, according to the North Carolina governors office...
Handbook methods such as those presented in ASHRAEs Fundamentals Handbook or Bansal and Minkes Passive Building Design: A Handbook of Natural Climatic Control (ISBN: 044481745X) are very useful in calculating airflow from natural sources for very simple building geometries.. Computational Fluid Dynamics (CFD): In order to predict the details of natural airflow, numerical computational fluid mechanics models can be used. These computer simulations are detailed and labor intensive, but are justified where accurate understanding of airflow is important. They have been used to analyze new buildings including the atrium of a courthouse in Phoenix and the hangar of an air and space museum in the Washington, DC area.. An extensive list of journals, books, and other reference material regarding natural ventilation and other passive technologies is included in the Solstice Archive. For example:. DOE Building Energy Codes Program. EERE Fact Sheet: Cooling Your Home Naturally Software packages for ...
Indoor air quality (IAQ) is a term which refers to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. IAQ can be affected by gases (including carbon monoxide, radon, volatile organic compounds), particulates, microbial contaminants (mold, bacteria), or any mass or energy stressor that can induce adverse health conditions. Source control, filtration and the use of ventilation to dilute contaminants are the primary methods for improving indoor air quality in most buildings. Residential units can further improve indoor air quality by routine cleaning of carpets and area rugs. Determination of IAQ involves the collection of air samples, monitoring human exposure to pollutants, collection of samples on building surfaces, and computer modelling of air flow inside buildings. IAQ is part of indoor environmental quality (IEQ), which includes IAQ as well as other physical and psychological aspects of life indoors (e.g., ...
The Integration of Engineering and Architecture: a Perspective on Natural Ventilation for the new San Francisco Federal Building ...
Think of it as instant smoke in a can. To members of the fire, safety and construction team in the science court atrium of the Mark O. Hatfield Clinical Research Center, it resembled a white river, a live rock concert, the genie coming out of the bottle. In reality it was artificial smoke pumped out of a theatrical fog machine for a test of the new hospitals smoke exhaust system. The test, conducted Sunday morning, August 15, was part of the CRC activation process. National Fire Protection Association standards require that multistory buildings with an atrium have a working smoke exhaust system. The test provided an operational check of the exhaust system, explained Bob Beller, a contractor representing the NIH fire marshal. It also allowed NIHs fire department to see where smoke may linger and where additional smoke ejection fans may be needed. The smoke filling the CRC air cavities was an artificial, nontoxic concoction of the kind used to dazzle audiences at operas, concerts and ...
Indoor air quality in schools may have an impact on students health and concentration, and activities for maintenance and improvement should be carried out on the basis of an objective evaluation of the indoor air quality. The purpose of this study is to suggest a method for setting the absolute and relative reference values for an indoor air quality index in the classrooms of the school. The pollutant concentration criteria in domestic and foreign codes, guidelines, certification systems, and indoor environment indexes were investigated and analyzed, and the absolute references with three levels were established for five pollutants including PM10, PM2.5, CO2, formaldehyde, and total airborne bacteria. The distribution characteristics of each pollutant were analyzed using the public data from the Ministry of Education, and peer groups for appropriate comparison were suggested for setting relative references. ...
eng] Ventilation systems are closely connected to indoor environment. In industrial spaces it has a major impact due to air quality and thermal comfort requirements, which leads into health and economy improvements. Confluent jets ventilation system has been assess in Söderhamn Eriksson, a machinery company located in Mariannelund, Sweden, since it has been proved as the best ventilation performance. Moreover this system is worthy for both heating and cooling purposes, although just heating case will be developed in this thesis. By means of modelling software such as Gambit and Airpak, the company¿s case could have been analyzed via Computational Fluid Dynamics (CFD) software, i.e. Fluent. The analyzed models were accepted after a thorough study of meshing parameters, bearing in mind computational limitations. Every temperature data gathered from simulation results has been verified with infrared camera figures taken at the company, thus contributing to reach reliable conclusions. As it is ...
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article{2141670, author = {Laverge, Jelle and Janssens, Arnold}, issn = {0378-7788}, journal = {ENERGY AND BUILDINGS}, keywords = {CHINA,RATES,OFFICE,BUILDINGS,PERFORMANCE,TEMPERATURE,AIR,Ventilation,Exergy,Primary energy,Heat recovery,Carbon dioxide emission,Operating energy cost,Degree days,Climate}, language = {eng}, pages = {315--323}, title = {Heat recovery ventilation operation traded off against natural and simple exhaust ventilation in Europe by primary energy factor, carbon dioxide emission, household consumer price and exergy}, url = {http://dx.doi.org/10.1016/j.enbuild.2012.04.005}, volume = {50}, year = {2012 ...
By Nate Adams. Weve all seen the studies: Our Indoor Air Quality is terrible! Its KILLING MILLIONS!!. The problem with these studies is that if youre like me you thought; great, another scare tactic. Or its really only a problem in Asia. Or of course, Indoor Air Quality (IAQ) may be a problem in someone elses house, but not mine. Even if youve read that poor IAQ is being found to be a cause of childhood asthma and mental illness, or that air pollution is the single largest environmental health risk according to the World Health Organization, it still feels too remote to worry about it.. To further enforce the disconnect, short of a government study, there has been no clear way for the average person could gain even the vaguest insight into their indoor air quality (but heres a hint, if you use air fresheners, you have an IAQ problem.). Well, thats all changed, no more guessing. Average Joes like you and me can now get a pretty good picture of how good or bad the air in our homes ...
Health complaints among employees of a 22 story municipal office building were investigated by NIOSH. A self administered questionnaire was distributed to all 438 employees on floors 15 through 22 of the office building requesting information on demographic characteristics, health history, health symptoms, and comfort concerns. Elevated carbon-dioxide (124389) levels were found in two locations, l
The term heat recovery (WRG for short) stands for different methods for the utilization of the thermal energy. This waste heat is not only produced as exhaust air in air conditioning systems and refrigerators. On a large scale, heat recovery also works from exhaust air in various industrial processes. For builders and homeowners who are planning to build a new building or renovate an old building, a ventilation system with a heat recovery system is recommended. The high efficiency of more than 90% brings considerable savings. At the same time, the reduction of energy costs is the top goal of every measure for heat recovery. However, the lower use of primary energy also meets ecological requirements, such as the reduction of CO2 emissions. In addition to energy saving, the protection of the living space, the ventilation without external noise, protected rooms for pollen allergists as well as harmless and comfortable room air conditions are the advantages of a living room ventilation unit. ...
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Mega Sale! Save 24% on the Mophorn Laminar Flow Hood 0.25-0.45m/s Air Velocity Laminar Flow Hood Filter HD-650 Air Clean Bench Fume Hood Laboratory(Laminar Flow Hood, Horizontal) by Mophorn at In The National Interest. MPN: Laminar Flow Hood. Hurry! Limited time offer. Offer valid only while supplies last. Introduction Air comes into plenum chamber through primary air filter at the top and centrifugal fan. Then air is blown out through high efficiency
Energy efficient homes are a vast improvement on traditional home designs by providing a consistent internal temperature for sustained comfort levels. Homes are now designed to limit the exchange of air from inside the house to the outside, reducing air-drafts which provides huge improvements in temperature control, but consequently reduces the availability of fresh air within the building. The solution to providing a regular flow of fresh air into the building at consistent temperatures is to install a Heat Recovery Ventilator system.. To improve airflow in and out of the building, fresh outside air is ducted into the home through a Heat Recovery Ventilator unit that transfers the controlled temperature of the internal air to the incoming external air. The temperature of the external air takes on the heat of the stale internal air before the stale air is exhausted out of the house.. During the colder months, heat is transferred from the warm indoor exhaust air into the cold outdoor supply air ...
The prevalence of prefabricated, portable classrooms (portables, relocatables, RCs) has increased due to class size reduction initiatives and limited resources. Classroom mechanical wall-mount heating, ventilation, and air conditioning (HVAC) systems may function improperly or not be maintained; lower ventilation rates may impact indoor air and environmental quality (IEQ). Materials in portables may off-gas volatile organic compounds (VOCs), including formaldehyde, as a function of age, temperature, and humidity. For a pilot study, public K-12 schools located in or serving target areas within five Los Angeles County communities were identified. In two communities where school districts (SD) consented, 1-3 randomly selected portables, one newer and one older, and one main building control classroom from each participating school were included. Sampling was conducted over a five-day school week in the cooling and heating seasons, or repeated twice in the cooling season. Measurements included ...
The prevalence of prefabricated, portable classrooms (portables, relocatables, RCs) has increased due to class size reduction initiatives and limited resources. Classroom mechanical wall-mount heating, ventilation, and air conditioning (HVAC) systems may function improperly or not be maintained; lower ventilation rates may impact indoor air and environmental quality (IEQ). Materials in portables may off-gas volatile organic compounds (VOCs), including formaldehyde, as a function of age, temperature, and humidity. For a pilot study, public K-12 schools located in or serving target areas within five Los Angeles County communities were identified. In two communities where school districts (SD) consented, 1-3 randomly selected portables, one newer and one older, and one main building control classroom from each participating school were included. Sampling was conducted over a five-day school week in the cooling and heating seasons, or repeated twice in the cooling season. Measurements included ...
If you werent aware, OSHA is in the process of establishing a new rule (could be years) for confined spaces in construction (here).. In the meantime, if you plan on entering a space that is confined, below is my standard answer: Get help!. What I mean by this is; obtain some assistance as early as you can. Ideally this might even be before you bid the job. I often suggest to send a superintendent or project manager to a 1/2 day training. Do not rely on the owner, or your general contractor to safely approve your employees entering this space. It is your job!. Although confined spaces are simple by definition (restricted opening, large enough to be in, and not meant to be occupied) , they can get complicated easily. The first thing to consider is what is/was in the space. Secondly, what are you bringing into it? If those two questions are answered completely, the dangers are usually identified.. When reviewing, consider: electrical, oxygen, engulfment, entrapment, access (ingress & ...
"Ventilation. - 1926.57". U.S. DOL, OSHA. Retrieved 3 July 2012.. ... Initiating automatic shutdown of equipment and ventilation if 2 ...
Ventilation; Lighting; Drainage of floors; and Sanitary conveniences. These provisions were repealed and superseded, as far as ...
When this happens the designer has to take into account several factors including: Heating/cooling zoning Ventilation Lighting ... ventilation; temperature control and welfare arrangements. Office space planning refers to optimizing the building structure ...
Ventilation - no proper air flow throughout a room causes the room to be too hot, windows, fans allow a man-made air current, ... "Ventilation , Department of Energy". energy.gov. Retrieved 2016-02-01. Song, Guowen (2011). Improving Comfort in Clothing. ...
"Ventilation" 10. "Eyes on Me" (co-produced with 2Epik) 14. "I Need More" 02. "Blessings" (featuring Drake) (co-produced with ...
... (NAVA) is a mode of mechanical ventilation. NAVA delivers assistance in proportion to and ... Conti G, Costa R (February 2010). "Technological development in mechanical ventilation". Current Opinion in Critical Care. 16 ( ... April 2009). "Comparison of energy expenditure between neurally adjusted ventilatory assist and pressure support ventilation in ... February 2010). "Patient-ventilator interaction during pressure support ventilation and neurally adjusted ventilatory assist". ...
Artificial ventilation Mechanical ventilation "Bragg-Paul Pulsator, model II, Europe, 1938-1939". Science Museum, London. ... The Pulsator provided life-saving treatment for many people in the early days of artificial ventilation. When the only ... While the less-severely ill patients preferred IPPV (intermittent positive pressure ventilation), IAPV was found to be best for ... Following an analysis of the ventilation induced by the 1934 model, physiologist Phyllis Tookey Kerridge recommended some ...
214, Limburg 2002, p. 267-946 Gompelmann, D.; Eberhardt, R.; Herth, F. J. F. (2013). "Collateral Ventilation". Respiration. 85 ...
Goldberg A (2002). "Noninvasive mechanical ventilation at home: building upon the tradition". Chest. 121 (2): 321-4. doi: ... Mehta, Sangeeta; Hill, Nicholas S (2001). "Noninvasive Ventilation". American Journal of Respiratory and Critical Care Medicine ... drawbacks led to the development of more modern positive-pressure ventilators and the use of positive-pressure ventilation by ...
CS1 maint: discouraged parameter (link) "Large Store Fire Tactics" (PDF). Tactical Ventilation. June 25, 2007. Archived from ...
"Collateral Ventilation". Respiration. 85 (6): 515-520. doi:10.1159/000348269. ISSN 0025-7931. Hammer, Jürg, ed. (2005). ...
Natural ventilation was poor because there were too few opening lights in the mill windows, and they were all at the same ... Chimneys should be built in each work room and turf fires lit in them to give better ventilation and combat contagion by their ... There was a requirement that the buildings have sufficient windows and openings for ventilation. Each apprentice was to be ... no ventilation; the apprentices and other children ragged, puny, not half clothed, and seemingly not half fed; no instruction ...
Mosque ventilation window. The arch supported Mosque. The square type mats depicted on the floor. The Arabian inscription that ...
"George's Dock Ventilation". Liverpool World Heritage. Retrieved 10 December 2008. "Memorial to the Engine Room Heroes of the ... Behind the Port of Liverpool building is the art deco George's Dock Ventilation Tower, whose design is heavily influenced by ...
Heating and ventilation. Air conditioning 7700-7975...............................Illumination. Lighting 8001-8581 ...
Traction motor blower 1. Machine ventilation blower. Cooling tower 2. Traction converter cubicle 2. High voltage cubicle. Main ...
However, when it comes to the ventilation of a kitchen, if the correct kind of filter is not used, heat recovery can be very ... Heat recovery makes it possible to save energy in the ventilation of a building. In particular, kitchen air is hotter than the ... Turboswing is a type of grease filter used in kitchen ventilation to remove grease particles from the air. It is typically ... "Ventilation 2012" (PDF). Inrs-ventilation2012.fr. Retrieved 2015-03-28. CS1 maint: discouraged parameter (link)[permanent dead ...
Jeffery, MD, J (6 June 1846). "Warming and Ventilation". Bristol Mercury. Arrowsmith's Dictionary of Bristol, 1906. James ...
Only spot ventilation was practical to keep personnel cool. This would require an unrestricted hull opening of the same size as ... Fire rooms employed some means of providing air for the operation of the flame to ignite the oil and associated ventilation. ... "ventilation_acquisition.aspx". public.navy.mil. Retrieved 2015-02-22. Personnel Qualification Standard for BB-61 Class ... The requirement for general ventilation and the requirement for sufficient combustion air are quite different. A typical ...
"Ventilation of Churches". Congregational Quarterly Oct. 1859: 369. Shivell, Kirk. The Steeples of Old New England. Lighthouse ...
Walkers of Wigan supplied the 28 feet (8.5 m) diameter ventilation fan and engine. Ventilation was important; the temperature ...
Tactical Ventilation 12. Fire Hose 13. Hose Operations and Hose Streams 14. Fire Suppression 15. Overhaul, Property ... and Extinguishers Ground Ladders Hose Salvage and Overhaul Fire Streams Fire Apparatus Ventilation Rescue First Aid Fire ...
Boron, W. F. (2009). Control of Ventilation. Medical physiology: a cellular and molecular approach (2nd ed., International ed ...
Reid's ventilation method was also applied more fully to St. George's Hall, Liverpool, the only building, he said, in which his ... Reid's ventilation system was adopted reluctantly by Barry in this new Palace of Westminster. Reid was engaged for five years ... The post was in the capacity of ventilation engineer, in effect; and with its creation there began a long series of quarrels ... Reid was regarded as an expert on ventilation, but his views differed from Neil Arnott, another leader in theories of air and ...
The most significant design aspect of the Holland Tunnel is its ventilation system; it is served by four ventilation towers ... The ventilation towers were the only major component of the Holland Tunnel that was not completed, but major progress had been ... The four ventilation towers contain a combined 84 fans. Of these, 42 are intake fans with varying capacities from 84,000 to ... All of the ventilation buildings have buff brick facades with steel and reinforced-concrete frames. The shafts within the river ...
Check date values in: ,date= (help) Amelia Levin (04/02/2012). "Energy-Efficient Ventilation". Food Service Equipment & ...
At Bearland Wood Morgans erected a ventilation flue which reprised an old method of ventilating a mine which had been thought ... 38 & 378-9. "Bearland Wood ventilation flue". West Somerset Mineral Railway Project. Sellick 1981, p. 35. sfn error: no target ... declared steam pumps to be unsatisfactory and ordered their older ventilation furnaces to be reinstated. The flue stands to ...
... and louvered gable ventilation. The playshed (1914) retains its open sides and hipped, timber-framed roof supported on timber ... and ventilation. Standardisation produced distinctly similar schools across Queensland with complexes of typical components. ...
He studied 3 such factors namely; diet, temperature and ventilation. Gray, John P. General Paresis, or Incomplete Progressive ...
"B&ES Member receives first smart skillcard". Heating and Ventilation Review. Retrieved 2016-02-05. "Refcom reassures sector ... Retrieved: 3 February 2016 "HVCA Membership approves name change". Heating, Ventilation & Plumbing Magazine. 14 December 2011. ... ventilation, air conditioning, refrigeration (HVACR) and related engineering projects. The association has undergone several ... which was instrumental in helping create the first industry training scheme for heating and ventilation engineers at Borough ...
Ventilation may refer to: Ventilation (physiology), the movement of air between the environment and the lungs via inhalation ... the expulsion of heat and smoke from a fire building Ventilation (mining), flow of air to the underground workings of a mine of ... a machine designed to move breathable air into and out of the lungs Ventilation (architecture), the process of "changing" or ... This disambiguation page lists articles associated with the title Ventilation. If an internal link led you here, you may wish ...
Displacement ventilation is best suited for taller spaces (higher than 3 meters [10 feet]). Standard mixing ventilation may be ... Hence, whether displacement ventilation could help with saving energy is still debated. In general, displacement ventilation is ... Displacement ventilation systems are appropriate in space where high ventilation is required, such as classrooms, conference ... Some studies have demonstrated that displacement ventilation may save energy as compared to standard mixing ventilation, ...
Ventilation FAQs. Can COVID-19 be transmitted through HVAC (ventilation) systems?. The risk of spreading the virus that causes ... Can ventilation filters effectively capture SARS-CoV-2 viral particles?. Filters for use in heating, ventilation, and air ... Ventilation improvements may include some or all of the following considerations:. *Increase outdoor air ventilation, using ... Considerations to Improve Ventilation. Consider ventilation system upgrades or improvements and other steps to increase the ...
Non-invasive ventilation. The setup for non-invasive ventilation using a mechanical ventilator. Modern devices are often much ... Non-invasive ventilation (NIV) is the use of airway support administered through a face (nasal) mask instead of an endotracheal ... The more formal name non-invasive positive pressure ventilation (NPPV or NIPPV) has been used to distinguish it from the use of ... Non-invasive ventilation has been used since the 1940s for various indications, but its present-day use for chronic breathing ...
Ventilation[edit]. Gravity and the weight of the lung act on ventilation by increasing pleural pressure at the base (making it ... On the other side Ventilation-perfusion mismatch is the term used when the ventilation and the perfusion of a gas exchanging ... In respiratory physiology, the ventilation/perfusion ratio (V̇/Q̇ ratio or V/Q ratio) is a ratio used to assess the efficiency ... thus leading to concept of ventilation-perfusion equality or ventilation-perfusion matching. This matching may be assessed in ...
Mechanical ventilation may be defined as a life-support system designed to replace or support normal ventilatory lung function ...
The use of noninvasive ventilation in acute respiratory failure has received much attention in recent years because of the ... Although noninvasive ventilation techniques in the form of negative pressure ventilation (e.g., tank ventilators, cuirass, ... Nasal mask ventilation in acute respiratory failure: experience in elderly patients. Chest 1992; 102: 912-917.PubMedCrossRef ... Negative pressure ventilation, who, when, how? Clini Pulm Med 2001; 8: 33-41.CrossRefGoogle Scholar ...
... is how outdoor air comes into a building. There are two types of ventilation. (1) Natural ventilation ... As ventilation brings outdoor air into a building, it also moves air out of the building. Because ventilation reduces any ... Ventilation can improve indoor air quality and health. Ventilation is an important control strategy for maintaining good IAQ ... Ventilation Codes. Standards and codes establish minimum ventilation rates (that is, the lowest recommended levels) to provide ...
DECORATIVE GRILLS ON NATURAL VENTILATION SUPPLY AND EXHAUST REDUCE CROSS SECTIONAL AREA BELOW MINIMUM. 050422 DNR RCVD. 070805 ...
AND NO DOCUMENTATION WAS AVAILABLE TO SUPPORT DETERMINATION OF REQD VENTILATION. RECD DNR ONLY ONE PAGE RECD. 9/12/06. ...
Source for information on Ventilation Management: The Gale Encyclopedia of Senior Health: A Guide for Seniors and Their ... Ventilation managementDefinitionVentilation management involves providing optimal mechanical ventilation in order to promote ... Ventilation management. Definition. Ventilation management involves providing optimal mechanical ventilation in order to ... Mechanical ventilation is used when a patient is unable to breathe adequately on their own. The purpose of ventilation ...
Determining Fenestration Product Ventilation Rating" uses an alternate methodology. Net ventilation area is determined by ... Air flow through open windows depends on many factors other than openable area or net ventilation area, including, but not ... To explore natural ventilation strategies for specific projects in detail, please contact Wausaus market managers for ... Operable windows allow for views and daylight, provide a seasonal opportunity for natural ventilation, and may help buildings ...
The Effect of Ventilation on Spontaneous Heating of Coal. *Field Study of Longwall Coal Mine Ventilation and Bleeder ... The research demonstrated that the movement of ventilation air and methane gas through a longwall bleeder ventilation network ... ventilation models were used to investigate the effects of larger panels and increased production rates on bleeder ventilation ... A mines primary ventilation system is designed to dilute and control these accumulations. However, increased production from ...
Because no mode of mechanical ventilation can cure a disease process, the patient should have a correctable underlying problem ... Many factors affect the decision to begin mechanical ventilation. ... Drugs & Diseases , Clinical Procedures , Mechanical Ventilation Q&A When is mechanical ventilation indicated?. Updated: Apr 11 ... Mechanical ventilation is indicated when the patients spontaneous ventilation is inadequate to sustain life. In addition, it ...
Ventilation and lighting: Ventilation is an important consideration in underground mining. In addition to the obvious ... In addition, when explosives are used to break hard rock, ventilation air carries away and dilutes the gases produced. Special ... In very cold climates incoming ventilation air must ... Ventilation is an important consideration in underground mining ... In very cold climates incoming ventilation air must first be warmed by gas- or oil-fired heaters. On the other hand, in very ...
Heating and Ventilation Standards. Whether your products fit perfectly inside an existing standard or seem to stretch outside ... And we are actively working with the industry to determine the applicability of ventilation standards for products already ... The safe performance of heating and ventilation equipment is critical to both residential and commercial applications. Our long ... challenges and requirements that impact our customers in the heating and ventilation space. ...
Each mode of ventilation is defined by its phase variable components: trigger, target, and cycle. These phase variables are ... Volume-controlled ventilation (VCV) Pressure-controlled ventilation (PCV) Pressure support ventilation (PSV) ... The three basic modes of ventilation include volume-controlled ventilation (VCV), pressure-controlled ventilation (PCV), and ... Each mode of ventilation is defined by its phase variable components: trigger, target, and cycle. These phase variables are ...
Proper air circulation can create steady airflow and regulate temperature as well as humidity throughout the room. With the incorporation of an air purification feature, a room can stay pleasant and clean. Learn More!
Modeling deep ocean ventilation in the Weddell-Scotia Confluence. DAVID M. HOLLAND and DOUGLAS G. MARTINSON, Lamont-Doherty ... Deep Ocean Ventilation Through Antarctic Intermediate Layers: The DOVETAIL program. Antarctic Journal of the U.S., 32(5). ... to quantify the relative contribution and importance of the WSC region to the overall ventilation of the world ocean; and *to ... At present, a large international program is underway to study this process under the name of the Deep Ocean Ventilation ...
This energy-efficient ventilation method minimises the energy lost in air conditioning. ...
A ventilation interface device is disclosed that may include a hollow cannula, at least one nasal insert and at least one ... Nasal ventilation interface and system. US20050235999 *. 4 Aug 2004. 27 Oct 2005. Wood Thomas J. Nasal ventilation interface ... The present invention relates to ventilation devices, and particularly to both ventilation devices having a nasal inserts and ... Methods, systems and devices for non-invasive ventilation including a non-sealing ventilation interface with an entrainment ...
A simple guide to buying and using local exhaust ventilation (LEV).. *INDG409 - Time to clear the air!. A workers pocket guide ... Controlling airborne contaminants at work: A guide to local exhaust ventilation (LEV) ...
Like exhaust ventilation systems, supply ventilation systems do not temper or remove moisture from the make-up air before it ... Supply Ventilation Systems. Supply ventilation systems use a fan to pressurize your home, forcing outside air into the building ... Supply ventilation systems allow better control of the air that enters the house than exhaust ventilation systems do. By ... Energy recovery ventilation systems usually cost more to install than other ventilation systems. In general, simplicity is key ...
HGTVRemodels shares the fundamentals of roof ventilation on HGTV.com. ... Attic Ventilation Proper ventilation helps water vapor to exit the attic, helping to dry out existing moisture. ... Roof ventilation helps to keep the attic dry and cool, but its also important to maintaining a healthy environment. Normal ... Choosing a Bath Ventilation Fan Consider room size, vent method and bonus features when picking a system ...
What types of ventilation can be used to remove air contaminants from a welders breathing zone? What are some examples of ... Where can I find some general guidelines for welding ventilation? ... Welding - Ventilation. CLOSE ALL. Where can I find some general guidelines for welding ventilation?. Ventilation is used for ... Local Exhaust Ventilation (most effective) Natural Dilution Ventilation. Dilution ventilation adds new fresh air to an area and ...
Patients aged 65 and older who survive an episode of mechanical ventilation during a hospitalization are more likely to suffer ... Older survivors of mechanical ventilation can expect significant disability. December 8, 2010. ...
The ventilation index is a product of surface windspeed and mixing height. Ventilation Index can be computed with winds at ... it is a conservative estimate of ventilation potential and most applicable to smoke that remains relatively close to the ground ...
Modelling the human ventilation system [2]. Make a simple model of the ventilation system. Investigate the effect of using ... Ventilation systems. Banner. Banner content: ,p, ,img alt= src=../../sites/default/files/PB_Society_of_Biology_logo_220.jpg ... Dissection of the ventilation system of a locust [5]. Dissect a locust to observe the organs within the animal and the ... A closer look at insect breathing systems makes it easier to appreciate the functions of the more familiar human ventilation ...
Basics of Mechanical Ventilation in Neonates Learning Objectives Slide 1 Learning ObjectivesLearning Objectives (cont.)(cont.) ... basics of mechanical ventilation in neonates * 1. NNC Module: Basics of Mechanical Ventilation in Neonates Learning Objectives ... Detect complications that may occur during mechanical ventilation. * 3. NNC Module: Basics of Mechanical Ventilation in ... 9. NNC Module: Basics of Mechanical Ventilation in Neonates Initial Setting of Mechanical Ventilation Slide 9 Initial Setting ...
Business Profile Reviews and Ratings for Freeflo Ventilation Systems Inc in New Westminster, BC. ... BBBs Business Profile for Freeflo Ventilation Systems Inc, ... Freeflo Ventilation Systems Inc. 4 years in business. 929 23 St ...
  • The setup for non-invasive ventilation using a mechanical ventilator. (wikipedia.org)
  • Numerous studies have shown this technique to be as effective as, and better tolerated than, intubation and mechanical ventilation in patients with exacerbations of COPD. (wikipedia.org)
  • Noninvasive mechanical ventilation in the weaning of patients with respiratory failure due to chronic obstructive pulmonary disease, A randomized, controlled trial. (springer.com)
  • 2) Mechanical ventilation actively moves outdoor air into a building. (ca.gov)
  • Most offices and other larger buildings, and many schools, have mechanical ventilation. (ca.gov)
  • Ventilation management involves providing optimal mechanical ventilation in order to promote the patient's recovery and to reestablish spontaneous breathing. (encyclopedia.com)
  • Mechanical ventilation is used when a patient is unable to breathe adequately on their own. (encyclopedia.com)
  • During the ventilatory weaning process, the modes of mechanical ventilation are gradually changed to allow the patient to initiate more breaths while the ventilator provides less. (encyclopedia.com)
  • The process also depends on the reason why the patient requires mechanical ventilation. (encyclopedia.com)
  • When is mechanical ventilation indicated? (medscape.com)
  • Many factors affect the decision to begin mechanical ventilation. (medscape.com)
  • Because no mode of mechanical ventilation can cure a disease process, the patient should have a correctable underlying problem that can be resolved with the support of mechanical ventilation. (medscape.com)
  • Mechanical ventilation is indicated when the patient's spontaneous ventilation is inadequate to sustain life. (medscape.com)
  • The components of mechanical ventilation inflation pressures. (medscape.com)
  • Cairo J. Pilbeam's mechanical ventilation: physiological and clinical applications. (springer.com)
  • Chatburn R, El-Khatib M, Mireles-Cabodevila E. A taxonomy for mechanical ventilation: 10 fundamental maxims. (springer.com)
  • MacIntyre N, Branson R. Mechanical ventilation. (springer.com)
  • Tobin M. Principles and practice of mechanical ventilation. (springer.com)
  • Energy-efficient homes -- both new and existing -- require mechanical ventilation to maintain indoor air quality. (energy.gov)
  • There are four basic mechanical whole-house ventilation systems -- exhaust, supply, balanced, and energy recovery. (energy.gov)
  • Dilution ventilation adds new fresh air to an area and can be accomplished by non-mechanical means such as opening windows and doors, or mechanical means such as wall and roof exhaust fans. (ccohs.ca)
  • Mechanical dilution ventilation uses wall fans, roof exhaust fans, or other mechanical means to prevent airborne contaminants from entering a worker's breathing zone. (ccohs.ca)
  • Patients aged 65 and older who survive an episode of mechanical ventilation during a hospitalization are more likely to suffer from long-term disabilities after leaving the hospital than those who survive hospitalization without mechanical ventilati. (scienceblog.com)
  • 1. NNC Module: Basics of Mechanical Ventilation in Neonates Learning Objectives Slide 1 Learning ObjectivesLearning Objectives (cont. (slideshare.net)
  • Monitor the neonate during mechanical ventilation. (slideshare.net)
  • 10. Detect any deterioration during mechanical ventilation and identify its causes. (slideshare.net)
  • 14. Detect complications that may occur during mechanical ventilation. (slideshare.net)
  • 3. NNC Module: Basics of Mechanical Ventilation in Neonates Introduction Slide 3 IntroductionIntroduction  Mechanical ventilation is an invasive life- support procedure with many effects on the cardiopulmonary system. (slideshare.net)
  • 4. NNC Module: Basics of Mechanical Ventilation in Neonates Indications of Mechanical Ventilation Slide 4 Indications of MechanicalIndications of Mechanical VentilationVentilation Absolute indicationsAbsolute indications If any of the following is present:If any of the following is present: 1. (slideshare.net)
  • 5. NNC Module: Basics of Mechanical Ventilation in Neonates Indications of Mechanical Ventilation Slide 5 Indications of MechanicalIndications of Mechanical VentilationVentilation (cont. (slideshare.net)
  • 2. Early treatment when use of mechanical ventilation is anticipated because of deteriorating gas exchange. (slideshare.net)
  • 7. NNC Module: Basics of Mechanical Ventilation in Neonates Starting Ventilator Setting Slide 7 Starting Ventilator SettingStarting Ventilator Setting  Intubate infant with an endotracheal tube according to body weight. (slideshare.net)
  • During intubation, infants require fractional inspired oxygen FiO2 that is 10% higher than what they were receiving before mechanical ventilation. (slideshare.net)
  • Schools will continue to focus on self-screening, mask wearing, physical distancing, enhanced cleaning, hand washing, increasing fresh air through mechanical ventilation and/or opening windows and other safety protocols to keep schools, students and staff safe. (tdsb.on.ca)
  • We are also grateful to Danby Appliances for donating 500 air purifiers to the TDSB that were distributed to 37 schools without mechanical ventilation and in the highest risk neighbourhoods for COVID-19 transmission, as identified by Toronto Public Health. (tdsb.on.ca)
  • In schools and classrooms with mechanical systems, we have adjusted them to increase the ventilation by increasing the number of daily air exchanges by starting equipment two hours prior to school opening and running them two hours after the end of the day. (tdsb.on.ca)
  • Clinical review: liberation from mechanical ventilation. (nih.gov)
  • Mechanical ventilation is the defining event of intensive care unit (ICU) management. (nih.gov)
  • Although it is a life saving intervention in patients with acute respiratory failure and other disease entities, a major goal of critical care clinicians should be to liberate patients from mechanical ventilation as early as possible to avoid the multitude of complications and risks associated with prolonged unnecessary mechanical ventilation, including ventilator induced lung injury, ventilator associated pneumonia, increased length of ICU and hospital stay, and increased cost of care delivery. (nih.gov)
  • This review highlights the recent developments in assessing and testing for readiness of liberation from mechanical ventilation, the etiology of weaning failure, the value of weaning protocols, and a simple practical approach for liberation from mechanical ventilation. (nih.gov)
  • Algorithm for liberation from mechanical ventilation. (nih.gov)
  • mechanical ventilation using "jet" administration of breaths at frequencies anywhere from 300-3000 breaths per minute to avoid some complications of more conventional ventilation. (drugs.com)
  • As part of its new low-income weatherization program for manufactured housing, the Bonneville Power Administration (BPA) is requiring mechanical ventilation in dwellings that receive other standard measures despite the fact that there's no mechanical venting requirement for retrofits of low-income, site-built housing. (homeenergy.org)
  • Building codes in Washington state and Bonneville Power Administration's specifications for new residential construction require mechanical ventilation systems. (homeenergy.org)
  • What are the benefits of Conventional Mechanical Ventilation (CMV)? (childrens.com)
  • Conventional mechanical ventilation (CMV) provides breathing support for infants and children who are too ill or immature to breathe on their own. (childrens.com)
  • What to Expect with Conventional Mechanical Ventilation (CMV)? (childrens.com)
  • Premature infants with certain lung complications often need conventional mechanical ventilation to survive. (childrens.com)
  • HFV may reduce lung injuries associated with conventional mechanical ventilation (CMV). (childrens.com)
  • Critically ill infants with certain lung complications often need some type of mechanical ventilation to survive. (childrens.com)
  • As part of Big Ideas Theater 2018, Thomas Piraino, RRT, of St. Michael's Hospital, discusses the steps and tools to help RTs visualize mechanical ventilation. (aarc.org)
  • Noninvasive mechanical ventilation is an effective technique for the management of patients with acute or chronic respiratory failure due to a variety of disorders. (springer.com)
  • Clinical applications are then considered in depth in a series of chapters that address the use of noninvasive mechanical ventilation in chronic settings and in critical care, both within and outside of intensive care units. (springer.com)
  • Due attention is also paid to weaning from conventional mechanical ventilation, potential complications, intraoperative applications, and staff training. (springer.com)
  • The closing chapters examine uses of noninvasive mechanical ventilation in neonatal and pediatric care. (springer.com)
  • Many would say, does a "green" home require mechanical ventilation? (selfgrowth.com)
  • If pocket friendly, go for balanced ventilation is recommended for every season providing you with mechanical ventilation by ensuring heat recovery and a prevailing stream of fresh air. (selfgrowth.com)
  • Intensive Care Nurses Author is the most recognized name in Critical Care Medicine Technical and clinical developments in mechanical ventilation have soared, and this new edition reflects these advances. (google.com)
  • past editor-in-chief of the American Journal of Respiratory and Critical Care Medicine - has completely revised this text, acclaimed by The Lancet as "the bible of mechanical ventilation. (google.com)
  • Mechanical ventilation can have an impact on patient comfort. (medtronic.com)
  • Spontaneous breathing trials (SBTs) may shorten time on mechanical ventilation and improve outcomes. (medtronic.com)
  • FOOTNOTE=Luetz A, Goldmann A, Weber-Carstens S, Spies C. Weaning from mechanical ventilation and sedation. (medtronic.com)
  • Sedation and weaning from mechanical ventilation: Linking spontaneous awakening trials and spontaneous breathing trials to improve patient outcomes. (medtronic.com)
  • 6 In conjunction with good sedation management, SBTs can help return your patients to unsupported breathing sooner, potentially reducing the risks and discomfort of prolonged mechanical ventilation. (medtronic.com)
  • Together with sedation holidays, spontaneous breathing trials may help you to ensure safe, early liberation from mechanical ventilation and better outcomes for your patients. (medtronic.com)
  • The value of mechanical ventilation using intermittent positive pressure ventilation delivered non-invasively by nasal mask was assessed in six patients with life threatening exacerbations of chronic respiratory disease. (bmj.com)
  • The arterial oxygen tension increased with mechanical ventilation to a median (range) of 8.7 (8.0-12.6) kPa and the carbon dioxide tension fell to 8.2 (6.5-9.2) kPa. (bmj.com)
  • This technique of mechanical ventilation avoids endotracheal intubation and can be used intermittently. (bmj.com)
  • Elliott M W , Steven M H , Phillips G D , Branthwaite M A . Non-invasive mechanical ventilation for acute respiratory failure. (bmj.com)
  • Mechanical ventilation alters the. (mendeley.com)
  • Ventilator-associated pneumonia (VAP) is common during mechanical ventilation (MV). Beside obvious deleterious effects on muco-ciliary clearance, MV could adversely shift the host immune response towards a pro-inflammatory pattern through toll-like receptor (TLRs) up-regulation. (mendeley.com)
  • Noninvasive pressure support ventilation in COPD patients with postextubation hypercapnic respiratory insufficiency. (springer.com)
  • Pressure support ventilation with a simplified ventilatory support system administered with a nasal mask in patients with respiratory failure. (springer.com)
  • These include T-piece, synchronized intermittent mandatory ventilation and pressure support ventilation. (encyclopedia.com)
  • Pressure support ventilation (PSV) augments the patient's spontaneous inspiration with a positive pressure "boost. (encyclopedia.com)
  • The three basic modes of ventilation include volume-controlled ventilation (VCV), pressure-controlled ventilation (PCV), and pressure support ventilation (PSV). (springer.com)
  • Attic ventilation "back in the day" was typically a set of gable end vents, which did a fair to poor job of venting the space. (activerain.com)
  • To dig into the science of why increasing attic ventilation will not solve and may even exacerbate attic moisture, it is first important to understand relative humidity. (activerain.com)
  • So attic ventilation is my question, i have a gambrel roof. (thisoldhouse.com)
  • Year-round attic ventilation ensures a cooler, drier attic that can extend roof life by preventing rot, premature aging and shingle distortion. (broan.com)
  • Determine your attic ventilation needs with our online calculator. (broan.com)
  • Plus, you can save even more with a 30% Federal Tax Credit on both the purchase price and installation costs of your Solar Powered Attic Ventilation. (broan.com)
  • Although noninvasive ventilation techniques in the form of negative pressure ventilation (e.g., tank ventilators, cuirass, rocking beds) have been used since the 1930s for the treatment of acute respiratory failure, the development of more responsive devices providing negative pressure ventilation, coupled with the recent development of noninvasive positive pressure ventilation (NPPV), have facilitated the increased use of noninvasive ventilation. (springer.com)
  • International Conferences in Intensive Care Medicine: Noninvasive positive pressure ventilation in acute respiratory failure. (springer.com)
  • Nasal intermittent positive pressure ventilation in weaning intubated patients with chronic respiratory disease from assisted intermittent positive pressure ventilation. (springer.com)
  • This intervention should not be started without thoughtful consideration because intubation and positive-pressure ventilation are not without potentially harmful effects. (medscape.com)
  • Non-invasive ventilation has been used since the 1940s for various indications, but its present-day use for chronic breathing problems arose in the 1980s for people with chronic respiratory muscle weakness, and in the 1990s on intensive care units and other acute care settings for acute respiratory failure. (wikipedia.org)
  • The use of noninvasive ventilation in acute respiratory failure has received much attention in recent years because of the recognition of the important complications that result from translaryngeal intubation and also the recent development of new and different devices to perform noninvasive ventilation. (springer.com)
  • Noninvasive ventilation as a systematic extubation and weaning technique in acute-on chronic respiratory failure, A prospective, randomized, controlled trial. (springer.com)
  • Noninvasive ventilation in immunosuppressed patients with pulmonary infiltrates, fever, and acute respiratory failure. (springer.com)
  • Nasal mask ventilation in acute respiratory failure: experience in elderly patients. (springer.com)
  • Adequate control of methane is particularly acute in longwall operations using bleeder ventilation systems, especially at the tailgate corner where methane accumulations are most likely to occur. (cdc.gov)
  • Effect of a protective-ventilation strategy on mortality in the acute respiratory distress syndrome. (medscape.com)
  • Pressure-controlled vs volume-controlled ventilation in acute respiratory failure: a physiology-based narrative and systemic review. (springer.com)
  • High frequency ventilation may be safer than other methods for some infants, especially in those with acute respiratory distress syndrome or certain lung injuries. (childrens.com)
  • This is a multiauthored review of noninvasive ventilation for acute and chronic respiratory failure. (springer.com)
  • A manual lung ventilation device and method suitable for acute manual respiratory resuscitation and lung ventilation of a person are disclosed. (freepatentsonline.com)
  • Nevertheless, in a life-threatening situation where tracheal intubation and bag-mask-valve ventilation cannot be performed to restore adequate gas exchange during acute respiratory failure, is it reasonable to consider PTJV as a viable interim maneuver. (medscape.com)
  • For additional videos on ventilation-related topics visit the AARC store or Current Topics 2019 . (aarc.org)
  • Moreover, recent awareness that avoidance of translaryngeal intubation preserves upper airway function (e.g., speech, swallowing), enhances patient comfort, decreases the incidence of nosocomial respiratory infections, and appears to improve morbidity and mortality in some individuals (Table 35-1) has led to greater emphasis on noninvasive ventilation. (springer.com)
  • Mehta S, Hill N. Noninvasive ventilation. (springer.com)
  • Martin U.J., Criner G.J. (2002) Noninvasive Ventilation. (springer.com)
  • A typical displacement ventilation system, such as one in an office space, supplies conditioned cold air from an air handling unit (AHU) through a low induction air diffuser. (wikipedia.org)
  • Instead of working as a stand-alone system in interior space, displacement ventilation system can also be coupled with other cooling and heating sources, such as radiant chilled ceilings or baseboard heating. (wikipedia.org)
  • Consider ventilation system upgrades or improvements and other steps to increase the delivery of clean air and dilute potential contaminants. (cdc.gov)
  • Heating and/or cooling systems in homes typically recirculate the same air after treating (heating or cooling) and are thus not part of an actual ventilation system because they do not bring in outdoor air. (ca.gov)
  • A mine's primary ventilation system is designed to dilute and control these accumulations. (cdc.gov)
  • However, increased production from larger longwall panels is challenging the limits of modern and accepted ventilation system designs to maintain safe working conditions. (cdc.gov)
  • Also, severe changes in atmospheric pressure may cause increased interaction with sealed areas of the mine that can overwhelm the normal ventilation system. (cdc.gov)
  • In addition, ventilation models were used to investigate the effects of larger panels and increased production rates on bleeder ventilation system designs to control methane accumulations on the longwall face and at the tailgate corner. (cdc.gov)
  • However, use of this design can greatly increase the complexity of the ventilation system. (cdc.gov)
  • Research will continue to quantify the effect of ventilation system design on the control of methane, particularly the interaction between methane sources from unconventional shale gas wells and the mine ventilation network. (cdc.gov)
  • Typically, an exhaust ventilation system consists of a single fan connected to a centrally located, single exhaust point in the house. (energy.gov)
  • These pollutants are a particular concern when bath fans, range fans, and clothes dryers (which also depressurize the home while they operate) are run when an exhaust ventilation system is also operating. (energy.gov)
  • A typical supply ventilation system has a fan and duct system that introduces fresh air into usually one -- but preferably several -- rooms that residents occupy most (e.g., bedrooms, living room). (energy.gov)
  • Whenever ventilation is used as a means of worker protection, the ventilation system should be used and maintained in accordance with acceptable procedures. (ccohs.ca)
  • A closer look at insect breathing systems makes it easier to appreciate the functions of the more familiar human ventilation system. (nuffieldfoundation.org)
  • Make a simple model of the ventilation system. (nuffieldfoundation.org)
  • If your vessel is not equipped with a power ventilation system (for example, a PWC), open the engine compartment and sniff for gasoline fumes before starting the engine. (boat-ed.com)
  • Human ventilation is also carried out by the respiratory system. (reference.com)
  • Because kitchens are now increasingly integrated in living areas, a good ventilation system is more important than ever. (gaggenau.com)
  • Any of you HVAC guys/gals design a Displacement Ventilation (DV) system in the Northeast USA? (physicsforums.com)
  • Solar Powered Vehicle Parking Ventilation System Pre-Cooling Analysis," SAE Technical Paper 2015-01-0367, 2015, https://doi.org/10.4271/2015-01-0367 . (sae.org)
  • Particularly this invention describes anemostat that is used as element of ventilation system when the intake and/or distribution of fresh air and/or air conditioning are needed in premises. (freepatentsonline.com)
  • One of the key features of new green home technology is its ventilation system. (selfgrowth.com)
  • A supply-only ventilation system forces a house to keep away moisture-laden air to go away. (selfgrowth.com)
  • this special kind of ventilation system has a balanced technology which separate fans to deliver an in and out airflow option. (selfgrowth.com)
  • I just joined this list because I, too, am looking for anyone with experience with the Wave Ventilation System. (thisoldhouse.com)
  • Control fresh air in your home with an Aprilaire whole-home ventilation system. (aprilaire.com)
  • Aprilaire can help you control fresh air and keep your family comfortable and safe with a whole-home ventilation system. (aprilaire.com)
  • Aprilaire whole-home ventilation solutions are installed as part of your home's heating and cooling system to expel stale, polluted air and replace it with fresh, clean air. (aprilaire.com)
  • Without a proper ventilation system, every time your air conditioner or furnace runs, you circulate the same stale air throughout your home. (aprilaire.com)
  • A whole-home ventilation system from Aprilaire can help you control the freshness of the air in your home to create a healthier, more comfortable environment for you and your family. (aprilaire.com)
  • Installed as part of your home's heating and cooling system, an Aprilaire ventilation system can expel cancer-causing pollutants and foul-smelling air and replaces it with fresh, outdoor air. (aprilaire.com)
  • To learn more about how an Aprilaire ventilation system can help improve your family's comfort and health, watch our Total Comfort Fresh Air video . (aprilaire.com)
  • Aprilaire ventilation solutions are installed as part of your heating and cooling system to remove polluted indoor air and then distribute filtered and conditioned outdoor air throughout the house. (aprilaire.com)
  • Our ventilation controller allows you to manually adjust the length of time your ventilation system runs, up to 60 minutes. (aprilaire.com)
  • Aprilaire offers two ventilation system options: our standard Ventilation Control System or the Energy Recovery Ventilator . (aprilaire.com)
  • Massachusetts Institute of Technology (MIT) is trying out an "intelligent" ventilation system as part of a program to reduce electricity usage by 15 percent over the next three years. (campustechnology.com)
  • Talk to a contractor in Folsom, CA about repairing or installing a ventilation system in your home. (bhg.com)
  • 2,3 If he or she passes the screen, you may consider adjusting the ventilator to provide no or reduced breathing support (less than 7 cmH 2 O inspiratory pressure), for example, via pressure support, continuous positive airway pressure (CPAP) or ventilation with a T-piece. (medtronic.com)
  • A new study appearing in the journal CHEST ® , published by Elsevier, suggests that treatment with nasal high-frequency oscillatory ventilation (NHFOV) is a beneficial management strategy in this population, and is superior to nasal continuous positive airway pressure (NCPAP) in preventing reintubation. (elsevier.com)
  • What Is Percutaneous Transtracheal Jet Ventilation? (rxlist.com)
  • Percutaneous transtracheal jet ventilation is a procedure to insert a needle into the trachea and pump in high-pressure air to breathe for the patient . (rxlist.com)
  • Percutaneous transtracheal jet ventilation (PTJV) is a procedure to deliver oxygen to the lungs . (rxlist.com)
  • What are the complications of percutaneous transtracheal jet ventilation? (rxlist.com)
  • Percutaneous transtracheal jet ventilation (PTJV) was introduced in the 1950s by Flory et al. (medscape.com)
  • PTJV is specifically useful for life-threatening situations, such as sudden respiratory failure , where quick access to the airways by conventional techniques (such as tracheal intubation and bag-mask-valve ventilation) cannot be performed. (rxlist.com)
  • In such circumstances, PTJV with a wide (large-bore) needle gives quick oxygenation and ventilation by providing adequate gas exchange and ensuring the patency of the airway until a definitive procedure (e.g., oral intubation with bronchoscopy followed by surgically gaining access to the trachea) can be performed. (rxlist.com)
  • Some reports have recommended PTJV only as a transient resuscitative measure for emergencies in which endotracheal intubation or other ventilation methods are not feasible. (medscape.com)
  • No matter what the cause of respiratory dysfunction, invasive ventilation can increase the risk of ventilator-associated lung injury, which may result in bronchopulmonary dysplasia (BPD) and subsequent neurologic impairment, especially in infants who require repeated or prolonged intubation. (elsevier.com)
  • Non-invasive ventilation ( NIV ) is the use of airway support administered through a face (nasal) mask instead of an endotracheal tube. (wikipedia.org)
  • Nasal ventilation to facilitate weaning in patients with chronic respiratory insufficiency. (springer.com)
  • A ventilation interface device is disclosed that may include a hollow cannula, at least one nasal insert and at least one exhaust port or may include a mask designed to cover a user's nose, mouth or both nose and mouth. (google.co.uk)
  • A nasal ventilation interface comprising a hollow body having at least one and preferably two nasal apertures, and at least one and preferably two inhale apertures, and at least one and preferably two nasal insert tubes each associated with one of the nasal apertures and having an annular sleeve that. (google.com)
  • 2. The ventilation interface according to claim 1 , wherein the at least one nasal insert comprises two nasal inserts, and each of the two nasal inserts is adapted to be inserted into a corresponding nares of the nasal passage. (google.com)
  • 3. The ventilation interface according to claim 2 , wherein the at least one seal portion comprises two seal portions, and each of the two seal portions corresponds to one of the two nasal inserts and is provided adjacent to one of the corresponding distal ends. (google.com)
  • 4. The ventilation interface according to claim 3 , wherein each of the two nasal inserts has a substantially oval cross section at the distal end. (google.com)
  • 5. The ventilation interface according to claim 4 , wherein each of the two nasal inserts is tapered from a portion adjacent the cannula to the distal end. (google.com)
  • 11. The ventilation interface according to claim 10 , wherein the at least one air output is substantially aligned with the at least one nasal insert. (google.com)
  • The manual lung ventilation device includes a nasal interface in fluid communication with a flexible chamber. (freepatentsonline.com)
  • 3. The manual lung ventilation device of claim 2 wherein the plurality of straps comprises a strap that generally extends from the headgear, between the eyes of the person, to the nasal interface. (freepatentsonline.com)
  • 5. The manual lung ventilation device of claim 4 wherein the securing device includes a distal portion configured to be too large to fit through the opening on the attachment portion of the nasal interface, thus configuring the headgear, the nasal interface, and the flexible chamber as a single physical and functional unit. (freepatentsonline.com)
  • 6. The manual lung ventilation device of claim 1 further comprising a conduit fluidly connecting the flexible chamber to the nasal interface, wherein the fluid conduit is integrally formed with the nasal interface. (freepatentsonline.com)
  • 7. The manual lung ventilation device of claim 1 wherein the nasal interface is a nasal mask adapted to fit over the nose of a person, the nasal mask including a seal element adapted to form a fluid tight seal against the face of the person. (freepatentsonline.com)
  • 8. The manual lung ventilation device of claim 1 wherein the nasal interface and the headgear are not separable without at least some disassembly of the device. (freepatentsonline.com)
  • 12. The manual lung ventilation device of claim 1 wherein the securing device holds the nasal interface in position on the person such that the device may be operated with one hand to ventilate the lungs of the person. (freepatentsonline.com)
  • Inhaled gases are given with positive end-expiratory pressure often with pressure support or with assist control ventilation at a set tidal volume and rate. (wikipedia.org)
  • In addition, it is indicated as a measure to control ventilation in critically ill patients and as prophylaxis for impending collapse of other physiologic functions. (medscape.com)
  • The pressure, volume, and flow to time waveforms for assist-control ventilation. (medscape.com)
  • Synchronized intermittent mandatory ventilation (SIMV) is a ventilator mode that delivers a preset number of breaths to the patient but coordinates them with the patient's spontaneous breaths. (encyclopedia.com)
  • The pressure, volume, and flow to time waveforms for synchronized intermittent mandatory ventilation (SIMV). (medscape.com)
  • Displacement ventilation systems are quieter than conventional overhead systems with better ventilation efficiency. (wikipedia.org)
  • Displacement ventilation systems are appropriate in space where high ventilation is required, such as classrooms, conference rooms, and offices. (wikipedia.org)
  • The research also indicates, that the draft rating model could predict the draft risk with good accuracy in rooms with displacement ventilation systems. (wikipedia.org)
  • According to some studies, displacement ventilation systems can only provide acceptable comfort if the corresponding cooling load is less than about 13 Btu/h-sf or 40 W/m2. (wikipedia.org)
  • Obtain consultation from experienced Heating, Ventilation and Air Conditioning (HVAC) professionals when considering changes to HVAC systems and equipment. (cdc.gov)
  • Ensure ventilation systems operate properly and provide acceptable indoor air quality for the current occupancy level for each space. (cdc.gov)
  • Operable windows allow for views and daylight, provide a seasonal opportunity for natural ventilation, and may help buildings qualify for credits under the U.S. Green Building Council's (USGBC) LEED® green building rating systems. (constantcontact.com)
  • Indoor Environmental Quality points for Increased Ventilation and Controllability of Systems - Thermal Comfort often apply when operable windows are part of an effective natural ventilation strategy, using the recommendations in the Carbon Trust "Good Practice Guide 237" [1998] and ASHRAE 62.1 -2013. (constantcontact.com)
  • This makes the energy costs associated with ventilation systems very high, which in turn has created a trend toward sealing unused sections of the mine and changing from diesel to electric machines. (britannica.com)
  • Require more maintenance than other ventilation systems. (energy.gov)
  • Exhaust ventilation systems work by depressurizing your home. (energy.gov)
  • Exhaust ventilation systems are most appropriate for cold climates. (energy.gov)
  • Exhaust ventilation systems are relatively simple and inexpensive to install. (energy.gov)
  • Exhaust ventilation systems can also contribute to higher heating and cooling costs compared with energy recovery ventilation systems because exhaust systems do not temper or remove moisture from the make-up air before it enters the house. (energy.gov)
  • Supply ventilation systems use a fan to pressurize your home, forcing outside air into the building while air leaks out of the building through holes in the shell, bath, and range fan ducts, and intentional vents (if any exist). (energy.gov)
  • During colder months, we will adjust the heating systems in schools to keep classrooms comfortable for students and staff in order to encourage windows being opened for a few minutes, a few times per day to increase ventilation. (tdsb.on.ca)
  • Bathroom ventilation fans are part of the HVAC systems that must be evaluated for energy efficiency under Title 24 before building permits can be issued. (hgtv.com)
  • Innovative kitchen and home design calls for new solutions also in the area of ventilation systems. (gaggenau.com)
  • Refer to our brochure for additional information on the diversity of our kitchen ventilation systems, their features and characteristics and what to consider when planning ventilation. (gaggenau.com)
  • Preliminary observations are offered about relationships between lubricant composition and formation of deposits in crankcase ventilation systems. (sae.org)
  • Balanced ventilation systems are of two type's- point-source or ducted. (selfgrowth.com)
  • Ventilation systems provide the means to distribute air within a building in order to maintain indoor air quality. (environmental-expert.com)
  • We design and manufacture ventilation systems with adjustable parameters regarding temperature, humidity and negative pressure for a wide range of objects from industrial buildings to specialist areas of very high technical and technological requirements. (environmental-expert.com)
  • Those systems in turn make adjustments to the ventilation flow as needed, allowing the facility to optimize airflow as efficiently as possible, based on occupancy, external temperature, and other factors. (campustechnology.com)
  • The utility company is working with MIT to conduct heating, ventilation, air conditioning, electrical, and lab systems improvements, and lighting fixture and control upgrades, in addition to other steps. (campustechnology.com)
  • Better Homes & Gardens Local Services connects you to contractors that specialize in ventilation systems. (bhg.com)
  • Gravity and the weight of the lung act on ventilation by increasing pleural pressure at the base (making it less negative) and thus reducing the alveolar volume. (wikipedia.org)
  • A pulmonary ventilation and perfusion scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply. (medlineplus.gov)
  • Lung scan, perfusion and ventilation (V/Q scan) - diagnostic. (medlineplus.gov)
  • 2. The manual lung ventilation device of claim 1 wherein the securing device comprising a plurality of straps fixably attached to the headgear. (freepatentsonline.com)
  • 4. The manual lung ventilation device of claim 1 wherein the attachment portion defines an opening for receiving the securing device. (freepatentsonline.com)
  • 9. The manual lung ventilation device of claim 1 wherein the flexible chamber comprises a self-inflating bag. (freepatentsonline.com)
  • 10. The manual lung ventilation device of claim 1 wherein the flexible chamber is adapted to be inflated by an external source of pressurized gas. (freepatentsonline.com)
  • 11. The manual lung ventilation device of claim 1 wherein the headgear comprises a skull cap having a single piece head conforming portion. (freepatentsonline.com)
  • Objective: Assessing the respiratory and lung mechanics of the patients in intensive care units is of utmost need in order to guide the management of ventilation support. (embs.org)
  • Recent research has also demonstrated a link between the use of cigarettes with filter ventilation and a specific type of lung cancer, namely the adenocarcinoma. (rivm.nl)
  • The V/Q ratio can be measured with a ventilation/perfusion scan . (wikipedia.org)
  • A pulmonary ventilation/perfusion scan involves two nuclear scan tests to measure breathing (ventilation) and circulation (perfusion) in all areas of the lungs. (medlineplus.gov)
  • A pulmonary ventilation/perfusion scan is actually 2 tests. (medlineplus.gov)
  • A chest x-ray is usually done before or after a ventilation and perfusion scan. (medlineplus.gov)
  • A ventilation and perfusion scan is most often done to detect a pulmonary embolus (blood clot in the lungs). (medlineplus.gov)
  • The provider should take a ventilation and perfusion scan and then evaluate it with a chest x-ray. (medlineplus.gov)
  • Other tests may be needed to confirm or rule out the findings of a pulmonary ventilation and perfusion scan. (medlineplus.gov)
  • Before choosing a ventilation fan, make sure it's one that will be adequate for the size of your bathroom. (hgtv.com)
  • Adequate stable ventilation is nowadays recognized as essential for the maintenance of good health in the stud . (chestofbooks.com)
  • Yet, failure to provide adequate ventilation is the most common mistake made in construction and management of modern horse facilities. (psu.edu)
  • one without the other is not adequate ventilation. (psu.edu)
  • Properly designed ventilation can dilute particles and gases in indoor air and prevent contaminants from accumulating to levels that may cause health or comfort problems. (ca.gov)
  • While both ventilation and perfusion increase going from the apex to the base, perfusion increases to a greater degree than ventilation, lowering the V/Q ratio at the base of the lungs. (wikipedia.org)
  • The ventilation scan is used to see how well air moves and blood flows through the lungs. (medlineplus.gov)
  • Inadequate ventilation is the most common mistake made in modern horse facilities. (psu.edu)
  • Although the emphasis is on stables with box stalls to each side of a central aisle, the principles are equally effective in Inadequate ventilation is the most common mistake made in modern horse facilities. (psu.edu)
  • One benefit of displacement ventilation is possibly the superior indoor air quality achieved with exhausting contaminated air out of the room. (wikipedia.org)
  • When indoors, ventilation mitigation strategies help to offset the absence of natural wind and reduce the concentration of viral particles in the indoor air. (cdc.gov)
  • 1) Natural ventilation is from air flowing passively from outdoor to indoor spaces, such as through open windows or doors. (ca.gov)
  • Because ventilation reduces any pollutants that might have accumulated in the indoor air, this is helpful in improving indoor air quality (IAQ). (ca.gov)
  • Ventilation is best used together with efforts to remove or reduce the sources of the indoor contaminants. (ca.gov)
  • In general, it is more efficient to eliminate or reduce sources of indoor pollutants or use local exhaust ventilation or air cleaning devices to remove them near their source than to control them by general ventilation of the whole home. (ca.gov)
  • Aprilaire offers a full line of Wi-Fi and wired thermostats for convenient, efficient control of temperature, fresh air ventilation and all indoor air quality accessories. (aprilaire.com)
  • Ideally, the oxygen provided via ventilation would be just enough to saturate the blood fully. (wikipedia.org)
  • If one were to consider humidified air (with less oxygen), then the ideal v/q ratio would be in the vicinity of 1.0 , thus leading to concept of ventilation-perfusion equality or ventilation-perfusion matching . (wikipedia.org)
  • [2] CPAP does not deliver ventilation but is occasionally used in conditions also treated with NIV. (wikipedia.org)
  • Due to the unique properties of thermal stratification, Displacement ventilation is typically used for cooling rather than for heating. (wikipedia.org)
  • The safe performance of heating and ventilation equipment is critical to both residential and commercial applications. (ul.com)
  • Our long involvement and ongoing active participation in the industry enables us to fully understand the emerging changes, challenges and requirements that impact our customers in the heating and ventilation space. (ul.com)
  • Ventilation is the circulation and refreshing of the air in a space without necessarily a change of temperature. (wartsila.com)
  • Natural ventilation - Natural ventilation occurs when changes in temperature or air density cause circulation in the space. (wartsila.com)
  • This research adopts the solar wing as the ventilation power supply and accomplishes the cabin real-time heat rejection by achieving the steady air circulation for both inside and outside environment. (sae.org)
  • Then, on the basis of the parameters of the prototype ventilation pipe, the ventilation model for the outside circulation is built. (sae.org)
  • Nor is proper ventilation satisfied if a tightly closed stable uses interior circulation fans to move stale air around the facility. (psu.edu)
  • The research also showed that face advance rates should be limited for specific face ventilation airflow quantities and degasification efficiencies, depending on methane emissions into the active longwall area. (cdc.gov)
  • Natural dilution ventilation should not be used to ventilate confined spaces in areas that have structural features that prevent or obstruct natural airflow, or when the airborne contaminant contains a carcinogenic substance, or other substance of high toxicity. (ccohs.ca)
  • If workpieces are too large they may block the ventilation airflow or cause pockets of high velocity air (which could affect shielding gases). (ccohs.ca)
  • The purpose of passive ventilation is to insure the inlet and outlet for safe airflow transmission to enrich the weather balance of the house according to climate change. (selfgrowth.com)
  • Today's features include motion-activated lights or heat-exchanger ventilation. (hgtv.com)
  • Heat exchanger models sell for about twice as much as standard bathroom ventilation fans. (hgtv.com)
  • There are two types of ventilation. (ca.gov)
  • What types of ventilation can be used to remove air contaminants from a welder's breathing zone? (ccohs.ca)
  • The recommended amount of ventilation is about 1 square foot per 300 square feet of attic area. (hgtv.com)
  • These physical principles drive air and moisture into the attic that no amount of ventilation will likely reduce. (activerain.com)
  • The purpose of ventilation management is to "breathe for them" until they are sufficiently recovered to initiate respiration. (encyclopedia.com)
  • For processes such as welding, brazing, soldering, and torch cutting, the primary purpose of ventilation is to remove air contaminants from the worker's breathing zone. (ccohs.ca)
  • A simple guide to buying and using local exhaust ventilation (LEV). (hse.gov.uk)
  • A workers' pocket guide to local exhaust ventilation (LEV). (hse.gov.uk)
  • Local exhaust ventilation (LEV) is always the preferred method of removing welding fumes and gases. (ccohs.ca)
  • What are some examples of Local Exhaust Ventilation? (ccohs.ca)
  • The Institute of Local Exhaust Ventilation Engineers (ILEVE) has been formed to promote the Science, Understanding, Education, Art and Practice of Local Exhaust Ventilation Engineering. (hse.gov.uk)
  • ILEVE is affiliated to the Chartered Institution of Building Service Engineers (CIBSE) and aims to provide a higher profile and focus for Local Exhaust Ventilation Engineers. (hse.gov.uk)
  • The Institute recognises competence in the practical application of local exhaust ventilation and raises the awareness of the importance of good air quality and ventilation in workplaces. (hse.gov.uk)
  • All gasoline-powered vessels, constructed in a way that would entrap fumes, must have at least two ventilation ducts fitted with cowls to remove the fumes. (boat-ed.com)
  • Proper ventilation helps water vapor to exit the attic, helping to dry out existing moisture. (hgtv.com)
  • Conventional wisdom, which remains strong, I might say entrenched, is that increasing the attics ventilation will resolve the problem of excessive attic moisture. (activerain.com)
  • So if we know that winter air is dry, with no ability to absorb moisture, it then stands to reason, and the science fully supports this, that introducing more of this wintry air through more ventilation as a means of drying is in all likelihood not going to garner the desired result. (activerain.com)
  • In reality adding ventilation to an attic space that is experiencing excessive moisture is like putting a band aid on your left arm, but the flowing gash is on your right leg. (activerain.com)
  • In winter, the ventilation goal changes from heat removal to controlling moisture, odor, and ammonia that have built up in the more closed environment of the stable. (psu.edu)
  • Create healthcare diagrams like this example called Bag-Mask Ventilation in minutes with SmartDraw. (smartdraw.com)
  • Veterinarians and professional horse handlers recommend good ventilation for stabled horses to maintain respiratory health. (psu.edu)
  • Air flow through open windows depends on many factors other than openable area or net ventilation area, including, but not limited to wind velocity, building height, stack effect, room configuration, shape factor, and most importantly, provisions for cross ventilation. (constantcontact.com)
  • Let's use it to re-write the building codes to ensure that every new apartment is designed so that natural cross-ventilation is a design requirement, as important as windows. (treehugger.com)
  • NCPAP is a widely used therapy to improve ventilation in preterm infants but is not successful in avoiding reintubation in all infants. (elsevier.com)
  • Most homes have only natural ventilation, with outdoor air coming indoors through open doors and windows and, especially in older homes, also through cracks in walls. (ca.gov)
  • Design teams sometimes employ state-of-the-art computational fluid dynamics analysis tools to optimize natural ventilation strategies in zero-energy building designs. (constantcontact.com)
  • Natural ventilation occurs when outside air enters through your open doors and windows. (aprilaire.com)
  • Natural ventilation isn't always feasible due to security risks and weather conditions. (aprilaire.com)
  • Small and unobtrusive, bathroom ventilation fans have benefitted from new technologies that make them smarter, quieter and more efficient than ever. (hgtv.com)
  • Unfortunately, bathroom ventilation fans often are set up so that they exhaust air to the space between ceiling joists, especially if the bath is located on a lower level toward the middle of the house. (hgtv.com)
  • Bathroom ventilation fans have different air flow capacities, measured in cubic feet per minute (cfm). (hgtv.com)
  • Bathroom ventilation fans that earn an EnergyStar label for efficient operation must be independently certified by the Home Ventilating Institute or the Air Movement and Control Association. (hgtv.com)
  • Many of today's bathroom ventilation fans feature quiet motors that let them perform at extremely low noise levels. (hgtv.com)
  • In some states, bathroom ventilation fans are required to meet building codes. (hgtv.com)
  • See the OSH Answers on Industrial Ventilation for more information. (ccohs.ca)
  • Roof ventilation helps to keep the attic dry and cool, but it's also important to maintaining a healthy environment. (hgtv.com)
  • Ridge vents are installed along the roof ridge (or ridges) to provide uniform ventilation throughout the attic, unlike turbines, louvers and or gable vents. (hgtv.com)
  • Effective ventilation requires air to exit at or near the peak of the roof with replacement air drawn through soffit venting and louvers. (broan.com)
  • Displacement ventilation can be a cause of discomfort due to the large vertical temperature gradient and drafts. (wikipedia.org)
  • Turn off any demand-controlled ventilation (DCV) controls that reduce air supply based on occupancy or temperature during occupied hours. (cdc.gov)
  • By measuring diurnal variations in flow through the surface conduits of the mounds of the species Odontotermes obesus , we show that a simple combination of geometry, heterogeneous thermal mass, and porosity allows the mounds to use diurnal ambient temperature oscillations for ventilation. (pnas.org)
  • Aprilaire ventilation solutions also help you monitor and control temperature and humidity for greater comfort at a lower cost . (aprilaire.com)
  • Aprilaire Wi-Fi Thermostats with ​IAQ Control provide the most convenient and accurate control of fresh air ventilation and temperature. (aprilaire.com)
  • Experiments have been conducted for verifying the static thermal transfer model and the ventilation model. (sae.org)
  • 8. Adjust ventilator settings to improve oxygenation and ventilation as indicated 9. (slideshare.net)
  • During the ventilation scan, you breathe in radioactive gas through a mask while you are sitting or lying on a table under the scanner arm. (medlineplus.gov)
  • If horses are to be kept in good health the air they breathe must be pure, hence the necessity for ventilation , or, in other words, the extraction of impure air and the introduction of fresh air. (chestofbooks.com)
  • In very cold climates incoming ventilation air must first be warmed by gas- or oil-fired heaters. (britannica.com)