Topical Terminology > Air Change
Air Change
For Air Change we have terms and definitions in 2 topics. The topics are Energy and Natural Gas.
Air Change (Energy) 
The replacement of a quantity of air in a space within a given period of time, typically expressed as air changes per hour. If a building has one air change per hour, this is equivalent to all of the air in the building being replaced in a one-hour period.
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Air Change (Natural Gas)
A method of expressing the amount of air infiltration and/or ventilation of a building or room in terms of the number of building volumes or room volumes exchanged per unit of time.
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