Why Is an Air Purifier’s CADR Typically Lower than Its Airflow?

In an ideal world, all the dirty air in a room would pass through the air purifier just once, giving a  100% clean room when the room’s volume of air has passed through the filter. However, some air will often ‘track back’ and pass through the air purifier again. This leads to an inefficiency since clean air is being re-cleaned.

Air purifiers may also have leakage around the HEPA filter, as well as through the filter (if the HEPA filter is not 99.99%). These factors are reflected in the fact the CADR is lower than airflow.

Learn more: The difference between CADR and airflow »

 


Free Guide to Breathing Safe

Want to learn more about breathing clean air? Join thousands more and stay up to date on protecting your health.

Was this article useful?00

Leave a Comment

Smart Air low cost purifiers

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.

Certified B-Corp air purifier company