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).

Learn More about: How to calculate an air purifier’s ACH or e-ACH »

Learn More about: What is the difference between air changes per hour (ACH) and equivalent air changes per hour (e-ACH) » 


Get Your Free Guide to Breathing Safe

Join the thousand keeping up on the latest research & knowledge on how to breathe safe. Sign up now and receive a free guide to breathing safe!

Was this article useful?00

Leave a Comment

Smart Air is a social enterprise that creates simple, no-nonsense air purifier and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.