[ardy42]

> Citation? Ther actual written standards of N95 vs KN95 are very similar, and if anything KN95 is probably slightly better. To meet KN95, the mask must be shown not to let air pass around the edges even while doing vigorous exercise, whereas N95 has no such requirement.

In my experience, actual KN95s have extensive leakage, especially around the nose. One factor may be that Western faces and Asian faces are different, and my understanding is that the KN95 standard and masks are tailored to Asian facial structures.

For instance, this is an assessment of a KN95 style mask I actually bought at a Menard's clearance a few months ago. It definitely has fit problems around my nose.

https://www.cdc.gov/niosh/npptl/respirators/testing/results/...

> While the above-listed product classification has similar performance requirements to NIOSH-approved devices, NIOSH does not have knowledge about the sustained manufacturer quality system and product quality control for these products. NIOSH also does not have knowledge about the product’s handling and exposures after leaving its manufacturer’s control.

> In addition, this product is an ear loop design. Currently, there are no NIOSH-approved products with ear loops; NIOSH-approved N95s have head bands. Furthermore,limited assessment of ear loop designs, indicate difficulty achieving a proper fit. While filter efficiency shows how well the filter media performs, users mustensure a proper fit is achieved.

[ungruntled]

I have 3 different brands of what are claimed to be KN95 masks. All do not fit in different ways. All use plastic nose bends, ear loops and either air comes out sides, chin, or nose area. I have 3M trifold N95s from before the pandemic and those fit perfectly without significant effort. The nose area uses metal and dense foam to ensure seal. I think the main seal issue with KN95s is that they are thin, flimsy and are missing some basic features like the foam, metal nose piece and head band.