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Seen this passed around elsewhere (can't find the original post I read, believe it passed by my tumblr dash):
https://encycla.com/Corsi-Rosenthal_Cube
If air purifiers are too expensive or even sold out because everyone is buying them, look into the humble box fan and MERV-13 furnace filters. The link shows a cube, which is probably ideal, but the original post I saw was as simple as just one taped against the fan.
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