§ 84.77 - Inhalation and exhalation valves; minimum requirements.

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§ 84.77 Inhalation and exhalation valves; minimum requirements.

(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.

                    
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§ 84.77 - Inhalation and exhalation valves; minimum requirements.

§ 84.77 Inhalation and exhalation valves; minimum requirements.