42 CFR §84.125
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Gas mask canisters containing filters for protection against particulates (e.g. dusts, fumes, mists, and smokes) in combination with gases, vapors, or gases and vapors, shall also comply with the requirements as prescribed in §§ 84.170 through 84.181, except for the airflow resistance test of § 84.172.