42 C.F.R. § 84.200 Inhalation and exhalation valves; minimum requirements.
Title 42 - Public Health
(a) Inhalation and exhalation valves shall be provided where necessary and protected against distortion. (b) Inhalation valves shall be designed and constructed to prevent excessive exhaled air from entering cartridges or adversely affecting canisters. (c) Exhalation valves shall be— (1) Protected against damage and external influence; and (2) Designed and constructed to prevent inward leakage of contaminated air.
Title 42: Public Health
PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES
Subpart L—Chemical Cartridge Respirators
§ 84.200 Inhalation and exhalation valves; minimum requirements.
