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Affordable DIY Air Purifier

There is a way for people to create an effective air purifier for under $40
I am asking for your help to get this information to the general public.

20” Box Fan $20 (Walmart) + 20” Merv 8 Furnace Filter $7 (Walmart) + Box Fan Filter Grip $12 (Amazon.com) = $39 Total

Box Fan Filter Grip is
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