The original post: /r/diy by /u/tfoster16 on 2024-12-22 19:23:06.
I have 4 unused 42" direct drive drum fans (Strongway direct drive 42in 3/5 HP, 17473 CFM) and was thinking about using one to make an air filter for a warehouse space (20k sqft) to run at night on weekends. I would create a cube frame to hold 20x20x4 merv 10 filters (probably 2" lumber) with 4 filters on each face and some foam insulation and tape to seal the fan to the cube. The Glasfoss filters on Amazon state they have a Merv 8 air flow (1390 CFM) so I would need filters on 4 sides of the cube ($192). Has anyone tried making a fan filter this large and did it work? Would I be better off making several standard size box fan filters instead?
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