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Topic: Ventilation

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	Ventilation - Wikipedia, the free encyclopedia
		Ventilation is air circulation of air, typically between a room, a tunnel, etc., and the air outside.
		Ventilation in a structure is also needed for removing water vapor, produced by breathing, burning, and cooking, and for removing smells, e.g.
		If a large fire is not properly ventilated, not only will it be much harder to fight, but it could also build up enough poorly burned smoke to create a smoke explosion, or enough heat to create a flashover.
	en.wikipedia.org /wiki/Ventilation (367 words)

	AllRefer.com - ventilation (Technology: Terms And Concepts) - Encyclopedia
		Proper ventilation requires also that there be a movement or circulation of the air within the space and that the temperature and humidity be maintained within a range that allows adequate evaporation of perspiration from the skin.
		It was formerly believed that the discomfort, headache, and lethargy commonly associated with poor ventilation were caused entirely by the increase in the amount of carbon dioxide and the decrease in the oxygen content of the air.
		An outgrowth of studies of problems of ventilation is the development of methods of air conditioning.
	reference.allrefer.com /encyclopedia/V/ventilat.html (635 words)

	Industrial Ventilation Guidelines -- 121002352
		Industrial ventilation is a method of controlling worker exposure to airborne toxic chemicals or flammable vapors by exhausting contaminated air away from the work area and replacing it with clean air.
		Dilution ventilation is usually accomplished with the use of large exhaust fans in the walls or roof of a building or room.
		Local exhaust ventilation is needed when employees are exposed to high toxicity chemicals, when large amounts of dusts or welding fumes are generated, or when increased heating costs from ventilation in cold weather are a concern.
	www.lni.wa.gov /wisha/p-ts/Ventilation (2460 words)

	Greenhouse Ventilation
		The purposes of ventilation are to control high temperatures during the summer caused by the influx of solar radiation, to maintain relative humidity at acceptable levels during winter, to provide uniform air flow throughout the entire greenhouse, and to maintain acceptable levels of gas concentration in the greenhouse.
		Ventilation systems for greenhouses must be considered for three climatic conditions that occur during the year--winter, summer, and spring-fall.
		In the preceding discussion, ventilation rates were expressed as a minimum ventilation rate of two air changes per hour in winter and a minimum summer ventilation rate of one air change per minute.
	edis.ifas.ufl.edu /AE030 (2261 words)

	Ventilation (Site not responding. Last check: 2007-11-06)
		Therefore, ventilation system design must be considered as an essential part of planning, development, and production of new shipboard equipment and systems and the facilities needed for their support.
		Ventilation components aboard ship suffer from the entry of salt-water spray, and re-entry of exhaust soot into supply air intakes resulting in internal corrosion to ductwork, and deterioration of air handling equipment.
		Ventilation system controls and displays that are difficult to understand may be linked to operating and maintenance problems.
	www.safetycenter.navy.mil /acquisition/ventilation (2421 words)

	Elite Software - Ventilation Tools
		Ventilation can be used to solve a wide variety of indoor air problems, and is also a foundation of building code requirements for maintaining indoor air quality.
		Ventilation Tools provides the diagnoses necessary to understand indoor air quality problems, the solutions required to overcome them, and a broad scope of reference material to support calculations for different building types and locations.
		Ventilation Tools is intended to be a practical program for everyday use by engineers, industrial hygienists and safety professionals, architects, building scientists, contractors, government air quality specialists, and other professionals in the indoor air quality field.
	www.elitesoft.com /web/hvacr/ventools.htm (691 words)

	The MSDS HyperGlossary: Ventilation
		Ventilation is the process of supplying fresh air air to an enclosed space in order to refresh/remove/replace the existing atmosphere.
		Ventilation is commonly used to remove contaminants such as fumes, dusts or vapors and provide a healthy and safe working environment; in other words, it is an engineering control.
		Ventilation is a critical concern in many occupational activities that generate dusts, fumes, mists, and vapors.
	www.ilpi.com /msds/ref/ventilation.html (1003 words)

	Indoor Air Quality (IAQ) and Home Remodeling
		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.
		Unless they are built with means of mechanical ventilation, homes that are designed and constructed to minimize the amount of outdoor air that can "leak" into and out of the home may have higher pollutant levels than other homes.
	www.epa.gov /iaq/homes/hip-ventilation.html (660 words)

	eMedicine - Ventilation, Mechanical : Article by Ryland P Byrd, Jr, MD (Site not responding. Last check: 2007-11-06)
		Positive-pressure ventilation means that positive pressure is applied at the patient's airway through an endotracheal or tracheostomy tube and causes gas to flow into the lungs until the ventilator breath is terminated.
		Modern ventilators are classified by the method of cycling from the inspiratory phase to the expiratory phase (ie, named after that parameter that signals the termination of the machine's positive-pressure inspiration cycle and changeover to the passive expiratory phase).
		After initiating ventilator support, the goal during the maintenance phase is to achieve adequate gas exchange without toxicity or complications, while allowing the primary cause of the respiratory failure to be treated or to resolve.
	www.emedicine.com /med/topic3370.htm (4451 words)

	OSHA TECHNICAL MANUAL - SECTION III: CHAPTER 3 (Site not responding. Last check: 2007-11-06)
		Industrial ventilation generally involves the use of supply and exhaust ventilation to control emissions, exposures, and chemical hazards in the workplace.
		Workplace investigations of ventilation systems may be initiated by worker complaints of possible overexposures to air contaminants, possible risk of fire or explosion from flammable gas or vapor levels at or near the lower explosive limit (LEL), or indoor air quality complaints.
		Local exhaust ventilation is designed to capture an emitted contaminant at or near its source, before the contaminant has a chance to disperse into the workplace air.
	www.osha-slc.gov /dts/osta/otm/otm_iii/otm_iii_3.html (6023 words)

	NIOSH Mining: Ventilation \| CDC/NIOSH (Site not responding. Last check: 2007-11-06)
		Describes the results of a case study where NIOSH demonstrates that significant increases in total mine airflow can be achieved and the ventilation improved in a large-opening stone mine by replacing an axial-vane mine fan with two 12-ft diameter propeller fans and adding a line of stoppings.
		Describes three alternative ventilation models for use in large opening underground mines with respect to their use in mines of various levels of development.
		Covers mine ventilation basics, reading ventilation maps and schematics, making air flow and gas measurements from which to judge the adequacy of the mine ventilation and applying correct procedures when cutting through from one section to another.
	www.cdc.gov /niosh/mining/topics/ventilation (927 words)

	MedlinePlus Medical Encyclopedia: Pulmonary ventilation/perfusion scan
		A pulmonary ventilation/perfusion scan is a pair of nuclear scan tests that use inhaled and injected radioactive material (radioisotopes) to measure breathing (ventilation) and circulation (perfusion) in all areas of the lungs.
		The ventilation scan is used to evaluate the ability of air to reach all portions of the lungs.
		A pulmonary ventilation and perfusion scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply.
	www.nlm.nih.gov /medlineplus/ency/article/003828.htm (884 words)

	The Comfort Zone: Ventilation Control Options
		For proper ventilation, whether in a classroom or an office, the continuous introduction and exhaust of outside air is a necessity during occupied times.
		The ventilation components are energized when the occupants arrive in the morning and turn on the lights.
		This philosophy proposes that ventilation is not only meant to introduce outside air into the room, but to also exhaust stale air, harmful off-gassed fumes, pesticides, and cleaning materials, and to do this even when the CO2 has not reached 1000 ppm.
	www.mbinet.org /web/magazine/comfort04_03.html (1118 words)

	Ventilation in Poultry and Livestock Shelters
		The objective in ventilation of an animal shelter is to maintain a healthy environment for animals and workers in the facility.
		Ventilation rates are designed to balance sensible heat (dry heat) gains and losses, as well as latent heat (moisture) gains and losses.
		Ventilation of structures can be accomplished naturally, mechanically, or through a combination.
	www.wvu.edu /~agexten/ageng/resource/agvent.htm (854 words)

	LBNL Residential Ventilation Project (Site not responding. Last check: 2007-11-06)
		Residential ventilation accounts for 1/3 to 1/2 of the energy load of dwellings and is a key factor in determining indoor air quality.
		Measurement of air exchange is fundamental to ventilation, both for direct determination and for model validation.
		Also passive ventilation as used in Europe may be quite cost effective, but needs to be developed for U.S. situations.
	epb1.lbl.gov /ventilation (1081 words)

	Volume-targeted versus pressure-limited ventilation in the neonate
		This is supported by animal studies of two kinds of "high-pressure" ventilation models, one where a high peak inspiratory pressure was set to deliver large tidal volumes, and a second where the chest was enclosed in a cast, so despite the same high PIPs the tidal volume remained low (Hernandez 1989).
		The tidal volume is measured at the ventilator rather than at the endotracheal tube, so the inspiratory tidal volume which is set must take into account the dead space of the humidifier and ventilator tubing, the circuit compliance and gas compression in the circuit.
		In the study by Piotrowski 1997 the control arm ventilation mode was intermittent mandatory ventilation, rather than a triggered mode that was used with the PRVC arm of that study.
	www.nichd.nih.gov /cochraneneonatal/McCallion/MCCALLION.HTM (7101 words)

	Gale Encyclopedia of Medicine: Lung perfusion and ventilation scan
		A lung ventilation scan measures the ability of the lungs to take in air and uses radiopharmaceuticals to produce a picture of how air is distributed in the lungs.
		In a lung ventilation scan, a mask is placed over the nose and mouth, and the patient is asked to inhale and exhale a combination of air and radioactive gas.
		In the lung ventilation scan, absence of marker material when the lung perfusion scan for the area is normal suggests lung disease.
	www.findarticles.com /p/articles/mi_g2601/is_0008/ai_2601000847 (551 words)

	Ventilation by Don Casey
		The traditional boat ventilator is the cowl vent, a vertical pipe with a bell-like horizontal opening.
		For continuous closed-cabin ventilation, the ideal ventilator may be one with a solar-powered fan.
		It is for ventilation that locker doors on boats are often louvered or given cane inserts.
	www.boatus.com /boattech/casey/31.htm (1106 words)

	ventilation on Encyclopedia.com (Site not responding. Last check: 2007-11-06)
		Weaning from mechanical ventilation: update on the latest strategies; protocol-directed approaches may improve outcomes.
		The ventilation shaft and fire escape for North Greenwich station.
		Ice dams may form and damage roofs because attic insulation is insufficient, attic ventilation is inadequate or the gutters and downspouts are clogged.
	www.encyclopedia.com /html/v1/ventilat.asp (1022 words)

	Ask The Builder - Home Building, Remodeling and Improvement Information Page
		Continuous ventilation is extremely important to avoid roof rot, reduce heating and cooling costs, and to maintain warranties of some asphalt shingles.
		Ventilation with exhaust fans for kitchen and bathroom is provided by these manufacturers.
		Ventilation and cooling with whole house fans can be very effective and energy efficient if the air is not highly humid.
	www.askthebuilder.com /Ventilation.shtml (1661 words)

	COR-A-VENT RIDGE VENTS
		Cor-A-Vent is the most complete provider of ridge vents and soffit ventilation products and applications for use on residential and light commercial buildings.
		Cor-A-Vent was established in 1976 by Gary Sells for the purpose of bringing a "state of the art" shingle-over ridge ventilating system to the marketplace.
		The necessity for proper attic ventilation is finally becoming recognized.
	www.cor-a-vent.com (258 words)

	Media Decor News: Plasma TV & A/V Ventilation (Site not responding. Last check: 2007-11-06)
		If the equipment is in a room, enclosure, wall space or closet with poor ventilation, it’s only a matter of time before the air in the enclosure is about as hot as the equipment; putting fans within the enclosure will just stir the heated air; the heat must be removed from the enclosure
		Devices to quietly ventilate a small cabinet or a large closet are available, devices that don’t just move the heated air around, but move it out of the enclosure, replacing it with cool room air.
		While not all installations require forced ventilation, it is important to be aware of some of the solutions.
	www.imakenews.com /mediadecornews/e_article000214451.cfm (1402 words)

	Closed-Loop Mechanical Ventilation (Site not responding. Last check: 2007-11-06)
		In the simplest form, closed-loop ventilation is the control of one output variable of the mechanical ventilator based on the measurement of an input variable.
		An example would be pressure support ventilation, in which flow (output) is constantly changing to maintain pressure (input) constant throughout inspiration.
		As the ventilator monitors airway pressure (the target), the control algorithm continuously modulates the flow (the output) to achieve the desired pressure.
	www.rcjournal.com /contents/04.02/04.02.0427.asp (447 words)

	Vent-Axia - The First Name in Ventilation
		Vent-Axia offer customised ventilation solutions, which are simple to install and use energy with unparalleled efficiency.
		We are committed to a development programme of low energy consumption fans that last longer, use less energy, are cheaper to run and provide you with the best possible indoor air quality.
		It will effortlessly remove your home’s polluted air and provide a constant supply of clean filtered air, allowing you and your family to live in an ideal indoor environment.
	www.vent-axia.com (162 words)

	Home Ventilation Options
		In the old days, buildings were ventilated by the wind and other uncontrolled forms of air leakage.
		Controlled ventilation systems collect the outgoing air into a single duct so it's possible to capture heat from that air with a heat-recovery ventilator (HRV).
		This type of heat-recovery ventilator provides balanced air flow and recovers up to 85 percent of the heat from outgoing air.
	www.oikos.com /esb/39/VentOpt.html (1627 words)

	Ventilation - Honeywell Your Home Expert
		The answer is a Honeywell Ventilation System that brings fresh air into the home.
		A Honeywell Whole-House Ventilation System exchanges outside air with inside air so the heating or cooling of conditioned air is not lost.
		Honeywell's Perfect Windowâ„¢ Ventilation Systems provide all the benfits of fresh air in your home, without the energy loss and safety concerns of an open window.
	yourhome.honeywell.com /Consumer/Cultures/en-US/Products/Ventilation (158 words)

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