4 ms·
0 to 10mm!? Some study. That’s barely a beard. Loses 40% effectivenes at 10mm.
by NDizzle 5y ago
0 to 10mm!? Some study. That’s barely a beard. Loses 40% effectivenes at 10mm.
- goodside 5y agoNo, that's the figure for KF94 and KN95 masks. For N95s it's only about a 20% loss of FFE.