Box Fan 1in Furnace Filter Brackets

Mount a 1in furnace filter to a box fan for simple cheap air scrubber. 

Good for allergy season or light floating particulates in the shop

Screw or rivet 3 mounts in place and you can easily slide a 20x20x1 (or whatever size you require) filter into place.

Print on it's side with a brim to ensure strength of print.  PLA-T works great.