20 Inch Box Fan Air Filter

thingiverse

I wanted an air filter for my house this year because of all the wildfires and smoke. Instead of buying an expensive device that uses costly filters, I designed clips for my affordable 20-inch Lasko box fan. These clips can hold any 20" x 20" x 1" furnace filter, including the reusable and washable one I found at Lowes. I created two sizes of clips: large ones that provide a strong hold and would be perfect for a permanent installation, and smaller ones that tend to sag but still work well. The small clips are easier to install because they're more flexible. If I had a garage, I'd use this setup while woodworking to keep the air clean.