During inhalations, the membrane closes against the support structure and blocks the opening, thereby not allowing airflow through the valve opening and thus protecting the wearer.
The valve opens and closes based on the wearer’s breathing pattern. Respirators with exhalation valves are thought to provide more comfort and may be better suited for longer periods of use. This membrane sits atop a support structure and lies beneath a plastic cover. In filtering facepiece respirators (FFRs) and elastomeric half mask respirators (EHMRs), exhalation valves typically include a membrane composed of natural rubber, silicone, or neoprene. Some types of respirators include an exhalation valve that opens to allow exhaled air to escape through the valve and closes to force inhaled air through the filter.
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