msz_0 🟣🎗️ @msz0.bsky.social

Building a Corsi-Rosenthal box (or two or five) is not really hard (can be a group project). Main drawback is noise, but you may prefer that to pollution. Quite cheap. Or kits with quiet PC fans - bit pricier, bit more trouble to assemble, still cheaper than commercial purifiers, I think

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