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What is the function of the exhalation valve on the mask?

April 26, 2017exhalation function mask valve

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What is the function of the exhalation valve on the mask?

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The exhalation valve is one way valve. When you inhale, the valve is closed to avoid the inhalation of contaminant air. When you exhale, the valve is open to allow the exhausted air expelled. The exhalation valve is suitable for heavy labor or humid working environments.