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Hundredflowers
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Evaluating a Corsi-Rosenthal Filter Cube
Hundredflowers9mo10

Hello! During the wildfires in LA, I’m seeing builds of CR boxes that are 1 filter attached directly to the back of a box fan. Obviously this is an emergency and any filtration is better than none. Volunteers are doing what they can with extremely limited resources. I am curious to know how efficacious these 1 filter box fans are in comparison to the 4 filter models that were originally popularized. 

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