Quick-print box fan air filter clip
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Clip for attaching a 20x20x1 filter to a box fan without additional hardware, prints in less than 30 minutes.
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Updated at source:
Model information
- Source
- Printables
- Category
- Other House Equipment
- License
- Creative Commons — Attribution
JUL 2026 UPDATE: Added "flipped" versions which should fit fans that are a bit wider. The 26mm flipped should fit the current Lasko 20-inch box fans, and you can take advantage of the feet to hold the filter in well enough with only two clips. I've also made "long" versions which have a longer overhang, for extra options.
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.