What are the masks with and without breathing valve?

Q: What kind of masks do you have with or without breathing valves?
A: It is not recommended to use a mask with a breathing valve in this epidemic. Because the function principle of the breathing valve is to blow the valve piece open during exhalation and the valve is closed during inhalation, the droplets or bacteria discharged by the wearer may be discharged out of the mask during exhalation, so wearing a mask with a breathing valve is only for protection The wearer himself does not protect others.

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