The exhalation valve of KN95 breathing valve type medical protective mask is a one-way valve. When exhaling, the positive pressure of the exhaust gas will blow the valve plate open, and the exhaled gas will be quickly discharged.

The design of the exhalation valve is exquisite, with several layers of flaps. When inhaling, the flap will close tightly to ensure that no particles enter. When exhaling, the flap will open to allow the hot and humid air to escape. At the same time, there is a soft layer inside. The flap can ensure that no small particles enter.