What Is the Difference Between Air Flow and CADR?

Air flow is the amount of air that goes through an air purifier over a certain period of time, usually given in cubic feet per minute (CFM) or cubic meters per hour. CADR is a measurement of an air purifier’s effectiveness at cleaning a whole room. It is calculated in a laboratory to either the GB-18801 standard or the  AHAM AC-1-2013 specification. An air purifier’s CADR is always lower than its air flow.

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