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kingnothing
on Dec 17, 2020
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Experiments on a $50 DIY air purifier that takes 3...
Wirecutter also has some info on this setup compared to commercially available options. tldr: a good HEPA filter will remove 99% of impurities, their box fan setup removed 87%.
https://www.nytimes.com/wirecutter/reviews/best-air-purifier...
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https://www.nytimes.com/wirecutter/reviews/best-air-purifier...