In humid or poorly ventilated or heavy working environments, using a respirator with a breathing valve can help you feel more comfortable on the exhale.The respirator mask cover is a one-way valve.Exhaled air can expel gases.There is no filter layer during the exhaust process.If the patient wears the mask, the virus may be excreted.Patients diagnosed or suspected of having coVID-19 should not wear such masks.

The principle:

When exhaling, the positive pressure of the exhaust blows off the valve plate, quickly discharging the gas inside the mask, reducing the muggy feeling when using the mask, and the negative pressure when inhaling will automatically close to avoid inhaling pollutants from the external environment.