Source: http://www.thriftyfun.com/tf285907.tip.html

What is a Cubic Feet Per Minute (CFM)?

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.

EPA

Source: http://www.thriftyfun.com/tf285907.tip.html

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