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 se

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/#what-if-you-just-put-a-furnace-filter-on-a-box-fan https://www.nytimes.com/wirecutter/reviews/best-air-purifier...