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A comment on A small DIY air purifier. Parent comment
https://www.homedepot.com/p/Honeywell-20-in-x-20-in-x-1-in-A...
For extra flow, set up a triangle with the fan on one side and 2 of these filters on the intake end as the other two sides, and duct tape some cardboard to seal the top and bottom.
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https://www.homedepot.com/p/Honeywell-20-in-x-20-in-x-1-in-A...
For extra flow, set up a triangle with the fan on one side and 2 of these filters on the intake end as the other two sides, and duct tape some cardboard to seal the top and bottom.