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by snivelus 1754 days ago
They've confirmed that they tested it. https://twitter.com/herpiko/status/1388621526757298178

I'm using this kind of DIY filter. After of putting the filter in the front of the fan for months, now I modified it into intake mode because of uncomfortable smell occurs whenever I turned the fan on. Some dusts that are already trapped here may have escaped again by sudden push of air.