Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Individual results for 51 participants wearing (a) N95; (b) snorkel masks with a high‐efficiency filter; and (c) snorkel masks with a powered air‐purifying respirator undergoing a seven‐step workplace exercise protocol. Results are harmonically averaged to provide an overall simulated workplace protection factor (SWEP‐F). Green boxes represent filtration ratios ≥ 100 (pass), red boxes represent filtration ratios < 100 (fail).
