Box fan wall/ ceiling mount

Wall mounts to mount a box fan with a 20x20x1 furnace filter on the wall. To use as an air purifier.

These are wall mount to use in conjunction with the 20x20x1 filter clips found here.

https://www.thingiverse.com/thing:3491620

You will need

4 of the 20x20x1 filter clips from link above.
Print 2 of these wall mount assemblies. 2 A's and 2 B's
2 - 1/4" x 20 x 3/4" long bolt
2 - 1/4" x 20 hex nut
2 - 1/4" fender washer
4 - 3" deck screws
4 - #6 or #10 washers. Big enough for your deck screws to fit into.