Repost
I am going to continue to nag y'all about this.
Works great for smoke from wildfires.
This really, honest to god works.
If you don't have one now, you need one soon.
a DIY box fan filtration system that removes smoke particles, and Covid-bearing aerosols, from indoor air, so you and yours don’t breathe the virus, and is superior for removing pollen and other allergens. Cleaning indoor air is important!
https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box
