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June 8, 2023 By Jim Rosenthal

Using a Corsi-Rosenthal Box to Remove Wildfire Smoke? Make Sure to Use the Right Filters

By Jim Rosenthal

Much of the Eastern United States is covered with wildfire smoke from the massive fires in Canada. A very effective way to avoid this respiratory hazard is to keep the windows closed and use an air cleaner – like a Corsi-Rosenthal Box. One word of caution – use the right filters. We recommend MERV 13 or the equivalent.

Using a standard MERV 8 (mechanical) filter will just blow the particles around – especially those under one micron in size. Unfortunately, these sub-micron size particles are the ones that are drawn deep into the lungs and can cause the most damage.

To confirm this we did some tests comparing Corsi-Rosenthal Boxes using MERV 13 and MERV 8 filters. These tests were conducted in a 18’X20’X8′ chamber. An ultrasonic humidifier was used to generate particles. While this is not “wildfire smoke”, particles of this size move in essentially the same ways. A “control” level was determined and then tests for the 2 CR boxes were run.

Corsi-Rosenthal Box Using 4 – 20X20X2 MERV 13 Filters
Corsi-Rosenthal Box using 4 – 20X20X2 MERV 8 (Mechanical) Filters

The Corsi-Rosenthal Box using the MERV 8 (mechanical) filters had essentially the same 0.5 um particle count levels as the Control while the MERV 13 version had a 94% reduction. MERV 8 (mechanical) filters are really inefficient on sub-micron size particles. These results also suggest that replacing these MERV 8 filters in residential and commercial HVAC systems would be advised.

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