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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.