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by throw0101a 1775 days ago
Or just use (at least) MERV13, and ideally MERV16, filters in your fresh air intake ducts:

* https://www.greenbuildingadvisor.com/article/understanding-f...

* https://www.researchgate.net/figure/Mean-PM-25-removal-effic...

You'll take care of >70% of PM2.5 particles.
1 comments
ihattendorf 1775 days ago
Careful with this, the increased resistance can damage systems that aren't designed for it.
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throw0101a 1775 days ago
In another comment I mention back pressures:

* https://news.ycombinator.com/item?id=28085720

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