what is air changes per hour in hvac

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ACH or Air Changes Per Hour is a metric that tells us how many times an HVAC device can fill up the full volume of a room with air. This is especially useful when comparing different air purifiers or air conditioners. Example: Let’s take an air purifier with 250 CFM airflow. We put it in a 200 sq ft room with the standard-height ceiling (8 ft).

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