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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 [..]

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 [..]

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 [..]

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 [..]

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 [..]

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 [..]

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 [..]

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 [..]

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 [..]