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The exhalation valve acts like a check valve, permitting air to flow out of the respirator facepiece, and preventing reverse flow through the valve on inhalation.
Exhalation valve that opens to allow exhaled air to escape through the valve and closes to force inhaled air through the filter. Exhalation valves typically include a membrane composed of natural rubber, silicone, or neoprene.
If respirators with exhalation valves are the only respiratory protection available when protection of a sterile field or other source control is required, covering the exhalation valve with a surgical mask or with a surgical mask and a face shield can be considered.
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