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Activated Carbon / Charcoal - A form of carbon ŽactivatedŽ by treatment with oxygen to have very high surface area, capable of removing many gases and odors from the air.
Aerosol - An assemblage of small particles, solid or liquid, approximately 100” or smaller in size. Example: dust, smoke, fog.
Aerosol Photometer - A device used to determine particle size and distribution in air by measuring the mass concentration of scattered light.
Aerosol Spectrometer - A device used to determine particle size and distribution in air by measuring the range of color produced by passing a white light through a prism.
Air - The mixture of gases that make up the atmosphere; ~78% nitrogen, ~21% oxygen with the balance consisting of smaller amounts of gases including argon, carbon dioxide, neon, helium, and other gases.
Airborne Particulate Cleanliness Classes - A set of particle concentration levels based upon the number of particles greater than or equal to specified sizes which are present in a unit volume of air.
Air Change - A measure of the amount of air moving in or out of a space because of leakage or mechanical ventilation. One air change is a volumetric flow of air equal to the cubic content of the space.
Air Cleaner - A device used for the removal of particulate or gaseous impurities from the air.
Air Diffuser - An air distribution outlet designed to direct airflow into desired patterns.
Air Filter - A device for removing particulate material from an air stream.
Aluminum Separator - Corrugated aluminum used to separate the folds of a pleated filter medium and provide air channels between them.
Ambient Air - Refers to untreated air existing in any location.
AMC - Airborne Molecular Contamination
Anemometer - An instrument for measuring the force or speed of air.
ASHRAE - American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. The organization which historically set standards for low and medium efficiency air filters.
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