Are there devices (like the frames over c-pap rubberized face masks) that can prevent air from seeping in from the sides? I think that the c-pap developers would have great insights on this topic. My own c-pap facemask is pretty air tight regarding air from the edges. Thots??
Surgical masks may prevent infections with the new coronavirus, but don't forget to wash your hands. Often.https://nyti.ms/2TXOdpy
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