Topical Terminology > Air Changes Per Hour (Ach)
Air Changes Per Hour (ACH)
For Air Changes Per Hour (ACH) we have terms and definitions in 2 topics. The topics are Carpet and Environment.
Air Changes Per Hour (Ach) (Carpet) 
Volume of air moved in one hour. One air change per hour in a room, home or building means that all the air in each of those environments will be replaced in one hour.
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Air Changes Per Hour (Ach) (Environment)
The movement of a volume of air in a given period of time; if a house has one air change per hour, it means that the air in the house will be replaced in a one-hour period.
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