3 ms·
The effect is multiplicative. If my mask filters 95% of the air on the way out, and yours filters 95% on the way in, that's 99.75% filtration. Add a HEPA into t
by blip54321 5y ago
The effect is multiplicative. If my mask filters 95% of the air on the way out, and yours filters 95% on the way in, that's 99.75% filtration. Add a HEPA into the room, and you're pretty safe.
Studies show the same too.