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Wisconsin | Often the filters are the same price no matter the size, four 20x25 with one 20x20 on the end, duct taped or siliconed together at the corners and attached to a fan works good.
edit: box fan is all that's needed, and put the filters on the exhaust, so the dust stays inside the filter box.
Edited by junk fun 7/9/2026 10:36
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My shop air filter