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The mask my wife bought for us at the beginning of the Wuhan Flu problem has a activated charcoal insert on the inside of the mask. We pull that out to wash the masks, and we change them after a while. It had a valve, but my glassed sure fog up so I know it leaks at the top.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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