[–] blendo 6y ago ↗ Tip for 20”x20” filters on a 20” box fan: Put the filter BEHIND the fan.The suction will secure the filter to the fan, and you’ll also keep dirt off the fan motor and blades.
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[ 4.6 ms ] story [ 17.9 ms ] threadThe suction will secure the filter to the fan, and you’ll also keep dirt off the fan motor and blades.