Air Exchange Rate: Used in two ways: 1 ) the number of times that the outdoor air replaces the volume of air in a building per unit time, typically expressed as air changes per hour; 2) the number of times that the ventilation system replaces the ...
Air Exchange Rate: The rate at which outside air replaces indoor air in a given space.
A measure of the volume of a substance flowing through air within a fixed period of time. With regard to indoor air, refers to the amount of air, in cubic feet, that is exchanged with outdoor air in a minute's time; i.e., the air exchange rate.
 See also: Indoor air, Cancer, Contaminant, Emission, Concentration
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