In light of the #Wildfire smoke blanketing huge swaths of North America and elsewhere, I’m reposting these instructions on how to build your own #CorsiRosenthal air filter. During the peak of the pandemic a number of designs were developed for low-cost, high efficiency air filters and the CR was the hands-down winner.

#AirQuality

corsirosenthalfoundation.org/i…

How to build your own Corsi-Rosenthal Box - Corsi-Rosenthal Foundation

Dedicated to providing cleaner safer air for all.

^{Corsi-Rosenthal Foundation}