Color:White-50PCS Dustproof Filter Breathing Filter Sponge Plastic Valve Face Parts Features: In hot and humid working environment with poor ventilation or heavy labor, the use of mask with breathing valves can help you feel more comfortable when exhaling The action principle of the breathing valve is to blow the valve plate open under the positive pressure of the exhaust gas when exhaling, so as to quickly exhaust the waste gas in the body and reduce the sense of stuffy heat when using the mask, and the negative pressure will automatically close the valve when inhaling, which can avoid inhaling the pollutants from the external environment. Specifications: Item name: Breather values plastic breathing filters Material: Plastic+Silicone Shape: Round Suitable for: Face cover mouth cover
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