We wuz inventors n sheeeeit.
(media.scored.co)
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By the way, you can make a very cheap, effective air purifier for one room or small appartment with a single 20x20x4 MERV 13 furnace air filter and a box fan.
Just tape the two together ( respect the air flow arrows for the filter ). MERV 13 will remove dust, small particles, bacteria, molds, pollen and lower viral load of the room. Lower MERV ratings will filter less stuff.
Don't use 20x20x2 for a single-filter DIY model, as the air flow will be too little. It has to be X4.
You can reduce air leak by covering the ''empty'' areas in corners of the box fan .
https://en.wikipedia.org/wiki/Corsi%E2%80%93Rosenthal_Box