Many ordinary people forced to wear face masks in pandemic times.Till now the outbreak haven't go yet,but we can't been locked down for long times,we have to work,have to exercise,have to go out for fun.Without face masks we can't take metro,bus,we can't eat in restaurant,even we are not allowed to shop. There is a problem for wearing normal 3-ply or KN95 face masks,comfortability.People can't breath freely,because of the air circulation/air exchanging in face masks,so people invented breathing Valve. The mask with breathing valve can help you feel more comfortable when you exhale in hot and humid or poorly ventilated or labor-intensive working environment.The function principle of breathing valve is when exhaling,the positive pressure of the exhaust gas will blow the valve plate open,in order to quickly exhaust the body gas,reduce the stuffy feeling when using the mask,and the negative pressure when inhaling will automatically close the valve,in order to ...
