StacksVerified U.S. regulatory reference

42 CFR §84.177

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Noise levels generated by any powered air-purifying respirators that cover the ears (i.e., hood or helmet) will be measured at the entrance to each ear at maximum airflow obtainable and must not exceed 80 dBA.