In a pinch you can even just tape one of the furnace filters to the back of a box fan. Take this info and spread it round! #lafires #palisades DIY box fan filters – Corsi-Rosenthal box - Clean Air Crew https://cleanaircrew.org/box-fan-filters/
DIY box fan filters – Corsi-Rosenthal box - Clean Air Crew
Also known as a Corsi-Rosenthal box, this DIY method of building your own air filter with MERV13 furnace filters and a box fan are an easy and cost-effective way to help clear indoor air from airborne virus particles, wildfire smoke, pollen, dust, an…Admin (Clean Air Crew)
