How Do I Calculate My Air Purifier’s Air Changes per Hour Or Equivalent Air Changes per Hour?

An air purifier’s e-ACH can be calculated by multiplying the air purifier’s CADR (make sure it is in CFM/cubic feet per minute) and multiplying by 60.  This will get you the air purifier’s air changes per hour.  Then, divide this number by the volume of your room (measured in feet cubed).

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