Corsi-Rosenthal (CR) Box
A Corsi-Rosenthal Box, more often called a CR box, is a DIY fan powered HEPA filter that you can build for less than $100, often less than $50.
CR boxes were invented during early covid when there was a larger demand for high quality, efficient, and cheap air filtration. Now, even as the public doesn’t care about the raging pandemic anymore, CR boxes remain a vital tool for covid safety. In your DIY lab they are a cheap and effective tool for creating filtered air in your brew space.
This is a perfect alternative to buying an expensive HEPA filtration system.
If you do some investigation, you have a little extra time, and you’re handy (which you should be to be homebrewing), you can build a CR box that utilizes a series of computer fans for a smaller footprint box.