[bitexploder]

For our use, faulty KN95 masks are better than nothing. Maybe they suck but it’s better than nothing and probably better than home made masks. You have to shop around and find reputable sellers that have been in business a while to mitigate risks as much as possible. I trust Aliexpress slightly less than Amazon these days which says a lot. Amazon used to have my unquestioning trust. Now I barely use them in favor of other retailers.

[Karrot_Kream]

Are they? It's unclear whether KN95 masks are better than a piece of fitted fabric around your mouth and nose. That's the trouble with masks; we don't know what works and what doesn't.

[bitexploder]

I wi work on the assumption that it is at least as good with a probability to be better. We know how this virus is transmitted and what is needed to filter it, it’s just a particle. We have strong evidence from the healthcare community that these masks keep workers COVID-19 free. They definitely work on other viruses of a similar size...