Airflow resistance test; Type C supplied-air respirator, pressure-demand class; minimum requirements.

  1. Law
  2. CFR 42
  3. Public Health
  4. Public Health Service, Department of Health and Human Services
  5. Occupational Safety and Health Research and Related Activities
  6. Approval of Respiratory Protective Devices
  7. Supplied-Air Respirators
  8. Airflow resistance test; Type C supplied-air respirator, pressure-demand class; minimum requirements.

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§ 84.157 Airflow resistance test; Type C supplied-air respirator, pressure-demand class; minimum requirements.

(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.


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