Should HEPA Filters go on the Front or Back of an Air Purifier?- Smart Air

Should Air Purifiers Have the Filter on the Front or Back?

2023-05-102018-09-28 by Thomas Talhelm

Should air purifiers have the filter on the front or the back–is it better to push or pull air? The Smart Air lab in Beijing ran tests of the same fan with the HEPA filter on either side, and the results contradict most people’s intuition. When I made my first …

New DIY Purifier Design Increases CADR 15%

2020-07-152017-02-20 by Thomas Talhelm

After I made my first DIY purifier, a design magazine called me up to interview me. I said, “You realize this has no design in it, right? It’s just a fan and a filter.” Now I actually have a design improvement! I’m calling it the DIY 1.1. The Problem The …

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