Box Fan Filter Mount

I use 20" box fans for supplemental air cleaning in my shop. This is a common practice, but the way to attach the filters differs greatly. I wanted something that would attach to the fan using the existing screws and would be small/print quickly.

This was relatively quick to design and print. You can check out the actual Fusion 360 file at http://a360.co/2BAdHhv or review the STEP file attached.