Bud TalbotJun 7, 2023

🔥USA East Coast friends: if the #Wildfire smoke is thick in your area, build a Corsi-Rosenthal box filter. These are inexpensive to build and very effective, and they filter and exchange the air in your house very efficiently. We use them extensively here in the western US when the fire smoke is bad. See this resource for how to build one:

https://cleanaircrew.org/box-fan-filters/

#smoke
#airquality
#airfilters

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, and more! If you can seal a box, you can build one (or

Clean Air Crew - COVID19 transmission and prevention resources. Airborne transmission, masks, ventilation, filtration, school info, and more.
Show threadINVISV
@bud_t For the lazier among us, I'd recommend just getting a box fan and taping a MERV 12 or better filter to it. Super cheap and easy and works nearly as well as a Corsi-Rosenthal box (perhaps not at COVID filtering, but for smoke it works great).
Jun 7, 2023 at 2:07amWeb
Show threadBud TalbotJun 7, 2023
@invisv that works, but it won't exchange a high volume of air as quickly. But yes, by all means use any filtering you can and move air through it!
Show threadINVISVJun 7, 2023
@bud_t Yeah, when I have a bit more time, I take a half step in that direction, and just do two filters in a triangle shape at the back of the box fan, using part of the box fan's cardboard box as the top and bottom.