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Definitions (34)
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ach
Air changes per hour or ACH is a common term used when discussing indoor air quality and ventilation. Air changes per hour measures how many times the air in a space – either single room or whole hous [..]
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air cleaning
Air cleaning is the process of removing airborne particulates and gases from the indoor atmosphere. Air cleaning may be accomplished by the running of a device designed specifically to remove particul [..]
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air handling unit
In regards to HVAC systems and other ventilation equipment, the air-handling unit is any item with a fan or blower component as well as elements such as heating and cooling coils. Other parts of the A [..]
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animal dander
Similar to human dandruff, animal dander is tiny (almost microscopic) skin cells shed by warm-blooded animals. Pet dander can contribute to poor indoor air quality. Animal dander is an allergen. Peopl [..]
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allergen
The AAFA states an allergen is any substance that triggers or causes an allergic reaction. Allergic reactions may include but are not limited to sneezing, running nose, itchy/watery eyes, nasal conges [..]
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antimicrobial
An antimicrobial has the ability to destroy or slow down the growth of microorganisms that cause disease. Ethyl alcohol, hydrogen peroxide and chlorine bleach are examples of antimicrobials. Sometimes [..]
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back-drafting
Back-drafting happens when the exhaust from combustion appliances (furnaces, hot water heaters, boilers and fireplaces) is transported down the flue and emitted into the home. This is caused by negati [..]
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biological contaminants
Biological contaminants or pollutants, produced by living things, can be found in items such as humidifiers, condensation pans and unvented bathrooms. However, some also can be found in carpets, beddi [..]
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carbon dioxide
Also known as CO2, carbon dioxide has a carbon atom bonded to two oxygen atoms. It is colorless, odorless and does not have any taste. Joseph Black originally identified carbon dioxide in the 1750s. B [..]
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