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Box Fan 1in Furnace Filter Brackets
Free
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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.
