An Air Changes Per Hour (ACH) is 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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| Air Change at travel-glossary.com | ■■■■ |
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| Auxiliary Power Unit (APU) | ■■■ |
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| Renewable resource | ■■■ |
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| Acclimatization | ■■■ |
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| Pollution | ■■■ |
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