October 4, 2023
Description
JUN 2023 UPDATE: Added some more sizes, to accommodate different screw depths. You want a little bit of squishing to prevent leakage, but not crushing. I'd print one of each size and then print three more of whatever fits best. The size listed is the gap between the flat sizes, and the ideal size will depend on how your fan's bezel is shaped.
There are some nasty wildfires making air quality quite bad right now. Attaching a filter to a box fan can improve air quality significantly.
Print four in the supplied orientation, and screw them onto the screws already on the fan, then insert a 20x20x1 furnace filter.
You can source the materials from a local hardware store, or online.
License:
Creative Commons — Attribution
mothdotmonster
