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Definition of Air change

Air change Definition from Science & Technology Dictionaries & Glossaries
Energy Glossary
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.
Air change Definition from Computer & Internet Dictionaries & Glossaries
Integrated Circuit Terminology
volume of air recirculating through a cleanroom per minute divided by the volume of the room. Generally the lower the cleanroom class the higher the air changes. A class 1000, class 100, class 10 and class 1, Cleanroom should have 5-6, 7, 7-10, and 10 air changes per minute respectively.
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