Infiltration Measures
The infiltration rate is the volumetric flow rate of outside air into a building, typically in cubic feet per minute (CFM) or liters per second (LPS). The air exchange rate, (I), is the number of interior volume air changes that occur per hour, and has units of 1/h. The air exchange rate is also known as air changes per hour (ACHs).
ACH can be calculated by multiplying the building's CFM by 60, and then dividing by the building volume. (CFM x 60)/volume
Read more about this topic: Infiltration (HVAC)
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