GroundRules
42 CFR 84.91: Breathing resistance test; exhalation.
Where this section sits in the code
- Title 42—Public Health
- CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES
- SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES
- PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES
- Subpart H—Self-Contained Breathing Apparatus
(a) Resistance to exhalation airflow will be measured in the facepiece or mouthpiece of open-circuit apparatus with air flowing at a continuous rate of 85 liters per minute.
(b) The exhalation resistance of demand apparatus shall not exceed 25 mm. (1 inch) water-column height.
(c) The exhalation resistance of pressure-demand apparatus shall not exceed the static pressure in the facepiece by more than 51 mm. (2 inches) water-column height.
(d) The static pressure (at zero flow) in the facepiece shall not exceed 38 mm. (1.5 inches) water-column height.
(e) Resistance to exhalation airflow will be measured in the facepiece or mouthpiece of closed-circuit apparatus with a breathing machine as described in § 84.88, and the exhalation resistance shall not exceed 51 mm. (2 inches) water-column height.
Collected 2026-08-27T02:26:11Z. Source file · JSON