Box Fan Filter Bracket
thingiverse
There are many tutorials out there on how to make your own cheap and effective indoor air cleaner, but most require you screw brackets on to the fan or use tape to hold the filter in place. These don't need either and are completely reusable! A pair of these brackets will hold a 20"x20"x1" MERV13 furnace filter onto the face of any 20" box fan that's about 4.4" thick to make an almost, but not quite HEPA filtration unit to help you and your family breath easier next wildfire season. For more info on how effective this filter and fan combo is, along with operating tips, check out https://www.pscleanair.gov/525/DIY-Air-Filter.
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