Comment by Hundredflowers on Evaluating a Corsi-Rosenthal Filter Cube · 2025-01-20T20:49:41.358Z · LW · GW

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.