The Corsi-Rosenthal Box is a DIY air purifier that uses HVAC filters and a simple box fan. I originally built one during Covid and later moved it to my garage where I do my woodworking. After having it on a cart for awhile, I decided to mount it from the ceiling where I plugged it into to a smart switch so I can turn it on/off with an app and where it doesn't take up floor space. I also when from a 4 filter design to a 5 filter design.
It's bigger then commercial air filters which goes from $100 to $800 so it's about the price of the cheapest commercial ones. Performance-wise, research on Corsi-Rosenthal boxes has shown that they perform very well. Making it just requires 4 or 5 filters, a box fan and tape.
For a garage shop, I don't need anything fancy.
