Re-Entrainment is the situation that occurs when the air being exhausted from a building is immediately brought back into the system through the air intake and other openings in the building envelope.

CADR is an acronym for Clean Air Delivery Rate. CADR is the volume of filtered air delivered by an air cleaner. CADR also determines how well an air cleaner reduces pollutants such as tobacco smoke, p [..]

Face Velocity is the velocity of air flow normal to the face of the filter.

An Airborne Particle Counter is an instrument for continuous counting of airborne particles larger than a given threshold size. The sensing means may be optical, electrical, aerodynamic, etc.

An Optical Particle Counter is a light scattering instrument with display and, or recording means to count and size discrete particles in air.

Surface Loading is the accumulation of collected dust on or close to the upstream surface of filter media.

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Acid Aerosol are acidic liquid or solid particles that are small enough to become airborne. High concentrations of acid aerosols can be irritating to the lungs and have been associated with some respi [..]

Activated Alumina is a form of aluminum oxide used as a desiccant (dryer) for gases. It is also used as a carrier for potassium pernanganate when the latter is used as a chemisorber.

Activated carbon is a form of carbon capable of removing certain gases from the air.