Air Changes Per Hour glossary and government resources

Air Changes Per Hour : 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. [Environmental Protection Agency]

Room air change rates
10 to 12 outside air changes per hour have been recommended. Some publications

Economizer case study
Health to use the federal standard of 15 air changes per hour with 100% outside

Docket Management Docket: 03N-0059 - Pharmaceutical Current Good ...
...with respect to the HEPA filtration and airflow rates or air changes per hour.

FDA itg Page 1
C. The air velocity meter can be used to calculate the number of air changes

EPA: Term :
...air changes per hour (ach). TRS Logo. The movement of a volume of air in a

Publication 392
Air changes Per Hour are based on the total air flow rate supplied to the space

Evaluating Ventilation in Multifamily Buildings
...(0.35 air changes per hour) can rely on infiltration is questionable for

Introduction to Blower Doors
...(CFM)--as opposed to flow compared with volume--air changes per hour (ACH).

Input Sensitivity Quiz
Now you need to enter a value for the number of air changes per hour within

California Code of Regulations, Title 8, Section 2540.5 ...
...is mechanical ventilation providing a minimum of four air changes per hour.

Energy Savers: Improving the Energy Efficiency of Manufactured ...
...and a whole-house ventilation rate of 0.10 air changes per hour. ... homes of

Chapter 51-11-1008 WAC - The Washington State Legislature
Estimated seasonal average infiltration rate in air changes per hour (ACH) is

AN ACT CONCERNING SMOKING IN CERTAIN ESTABLISHMENTS.
...range of six to ten air changes per hour and filters not less than ninety-five

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