42 CFR 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.
Title 42 published on 2014-10-01
no entries appear in the Federal Register after this date.