U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

All TitlesTitle 42Chapter IPart 84Subpart K - Subpart K—Air-Purifying Particulate Respirators
§ 84.170 - Air-purifying particulate respirators; description.
§ 84.171 - Required components and attributes.
§ 84.172 - Airflow resistance test.
§ 84.173 - Exhalation valve leakage test.
§ 84.174 - Filter efficiency level determination test—non-powered series N, R, and P filtration.
§ 84.175 - Instantaneous filter efficiency level determination test—PAPR series HE, PAPR100-N, and PAPR100-P filtration.
§ 84.176 - Fit test—PAPR classes HE and PAPR100.
§ 84.177 - Total noise level test—PAPR classes HE and PAPR100.
§ 84.178 - Breath response type, airflow resistance test—PAPR classes HE and PAPR100.
§ 84.179 - Silica dust loading test—PAPR series HE filtration.
§ 84.180 - Particulate loading test—PAPR series PAPR100-N and PAPR100-P filtration.
§ 84.181 - Communication performance test—PAPR class PAPR100.
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