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throwitaway222 • today at 4:59 PM • 3 replies • view on HN

This works better than all of the hepa purifiers on the market:

  1 20" box fan.
  4 20" mirv 13 filters (cheapest is likely costco or lowes or home depot - buy in a 4 pack to save money).
This is still expensive but the amount of air processing per hour is incredible.

More info Search "Corsi-Rosenthal Box" or click https://filterbuy.com/resources/air-filter-basics/how-to-bui...

Don't go hepa because it slows down the filtering too much. I use this technique in my house and it cuts down on pollen, smoke and mold. You'll feel a lot better than a tiny expensive hepa that has proprietary filters.

Replies

instaclay • today at 5:32 PM

True, but the MacGyver looking thing in the middle (or side,whatever) of your living room doesn't sit right with everyone. People pay money for aesthetics and take the hit on efficiency.

I'm seeing some 3d printed projects popping up that look to be filling this gap though.

jedberg • today at 5:31 PM

My brother in law did this. It is boxy and ugly, but damn does it work.

dcrazy • today at 5:30 PM

I’m not dedicating 1600 cubic inches of my living space to an ugly homemade piece of furniture that I have to rebuild whenever I change a HEPA filter. I suspect I am not alone in this.