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thehappysnail

Holy fuck

musingsofaraven

This works best if you keep windows closed.

Another design is using 2 20x25x1 filters, taping them to the sides of the box fan and then to each other so they sort of make a triangle, then cutting cardboard to make a top and bottom to the triangle.

This was discovered as a more effective design during the 2020 US west coast fires.

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https://tombuildsstuff.blogspot.com/2013/06/better-box-fan-air-purifier.html

Better Box Fan Air Purifier
A better more efficient and odor eliminating homemade air purifier than just taping a 20x20x1 filter to a box fan. Sometimes you need to
tombuildsstuff.blogspot.com
air filtersair purifiers

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