C.F.R. » Title 42 » CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES › SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES › PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES › Subpart H—Self-Contained Breathing Apparatus

42 C.F.R. § 84.77

Inhalation and exhalation valves; minimum requirements

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(a) Inhalation and exhalation valves shall be provided where necessary and protected against damage and distortion.

(b) Exhalation valves shall be—

(1) Protected against external influence; and

(2) Designed and constructed to prevent inward leakage of contaminated air.