Box fan air purifier bracket
thingiverse
I have been using painters take to attached 20201in furnace filters to a 20*20in box fan for years as a cheap and particularly effective air purifier. I designed this simple bracket so that I could slide the filters in and out. I used two sided tape to mount the bracket and seems to work well. It is not are air tight as using painters tape but I am very happy with the fit considering the convenience.
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