If Your Mask Has a Valve, It's Half Useless 20:17 Vitals Edit If you’re wearing a face mask with a little plastic valve embedded in it, you should know that valves compromise the effectiveness of the mask—and this is true whether your mask is a hardware-store N95 or a designer cloth mask. Read more... Share on Facebook Share on Twitter Share on Google Plus RELATED POSTS If Your Mask Has a Valve, It's Half...How to Warm Up for a Cold Weather W...How Bad Is It to Lose Your Grip on ...
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