@roykert
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170
Last update
2021-05-05 12:50:33
    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.

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