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guo feng valve face mask hole air filter face mask Description

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    A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is placed in one of several locations in the exhale flow stream to remove contaminants from the exhaled

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    The colors in the thermal images below show the change in surface temperature of the respirators as the model inhales and exhales. Inhalation is the cooler part of the cycle; with both valved and unvalved respirators, the 3M filter media facilitates an easy draw of cooler external air.. As the wearer inhales, air is pulled through the respirator and surface temperature decreases.

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