Asbestos on Nostr: Wildfire smoke? The Corsi Rosenthal box is better than many HEPA home air filters. ...

Wildfire smoke? The Corsi Rosenthal box is better than many HEPA home air filters. And is less than half the price. You can put one together for about $70usd.
https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box
Use the right air filters though
(yes this is a business site, but if you notice the author is Jim Rosenthal.)
https://www.texairfilters.com/comparing-the-performance-of-corsi-rosenthal-boxes-made-with-box-fans-and-pc-fans/