[throw0101c]

Carbon filters on your incoming air supply (e.g., ERV):

* https://shop.aprilaire.com/search?q=Carbon+Air+Filter

[lazide]

1) broken link 2) any (actual) HEPA filter works too.

A lot of stuff sold as HEPA doesn’t meet the original HEPA standards though, so needs to be actually rated for the super small particles.