Do You Have Pressure Drop Data Available for your HEPA Filters?

First off: great work! It looks like you’re really serious about building an effective DIY air purifier. Pressure drop data for a HEPA filter can help you find a suitable fan and calculate a rough approximation of the airflow (albeit not CADR) of the purifier.

Unfortunately, however, we do not have pressure drop values available for our HEPA filters for different airflows and/or fan configurations. To provide these would require us to test each HEPA filter for different fan and airflow configurations.

General pressure drop values for HEPA filters

Having said this, a rough approximation is that in our testing, most Smart Air HEPA filters have a pressure drop of between 50-200Pa, depending on the airflow, air duct and how clogged the filter is. This can be used as a rough range to find and size a fan.

Learn more: what’s the difference between the airflow and CADR of an air purifier?


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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.