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there is a company that's selling DIY air purifiers in India (and probably its neighbouring countries).. https://smartairfilters.com/in/en/product/diy-1-1-air-purifi...

they put the filter in front of the fan, not the air intake aka backside.. they have detailed info on how their purifiers are effective than other costly brands.. probably putting the filter on the front side is more effective?

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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.

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