42 CFR 84.157
§ 84.157 Airflow resistance test; Type C supplied-air respirator, pressure-demand class; minimum requirements.
United States · 42 CFR — Public Health · Status: effective
Cite this
- Citation
- 42 CFR 84.157, § 84.157 Airflow resistance test; Type C supplied-air respirator, pressure-demand class; minimum requirements, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/201770
- Permanent ID
ys:prov:201770@1- SHA-256
44abda1f0ea2d865d475f1373a27581fd21a4b945470d98e6c523ee36d5aa33b
The hash is SHA-256 of this version's text, with every run of whitespace collapsed to a single space and the ends trimmed. The ID always leads back here, and checking it says whether the text you cited is still the current version.
Full text
(a) The static pressure in the facepiece shall not exceed 38 mm. (1.5 inches) of water-column height.
(b) The pressure in the facepiece shall not fall below atmospheric at inhalation airflows less than 115 liters (4 cubic feet) per minute.
(c) The exhalation resistance to a flow of air at a rate of 85 liters (3 cubic feet) per minute shall not exceed the static pressure in the facepiece by more than 51 mm. (2 inches) of water-column height.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.