Source: http://www.thriftyfun.com/tf247562.tip.html

What is Air Change?

A measure of the rate at which the air in an interior space is replace by outside (or conditioned) air by ventilation and infiltration; usually measured in cubic feet per time interval (hour), divided by the volume of air in the room.

U.S. Department of Energy

Source: http://www.thriftyfun.com/tf247562.tip.html

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