[Code of Federal Regulations]
[Title 42, Volume 1]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 42CFR84.77]

[Page 520-521]
 
                         TITLE 42--PUBLIC HEALTH
 
    CHAPTER I--PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN 
                                SERVICES
 
PART 84_APPROVAL OF RESPIRATORY PROTECTIVE DEVICES--Table of Contents
 
              Subpart H_Self-Contained Breathing Apparatus
 
Sec. 84.77  Inhalation and exhalation valves; minimum requirements.

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

[[Page 521]]

    (b) Exhalation valves shall be--
    (1) Protected against external influence; and
    (2) Designed and constructed to prevent inward leakage of 
contaminated air.