View all text of Subpart I [§ 84.110 - § 84.126]
§ 84.123 - Exhalation valve leakage test.
(a) Dry exhalation valves and valve seats will be subjected to a suction of 25 mm. water-column height while in a normal operating position.
(b) Leakage between the valve and valve seat shall not exceed 30 milliliters per minute.