Quote:
Originally Posted by Xist
A bandana, homemade mask, and paper surgical mask would not seal, and they only filter the air that goes through them, not what leaks past when you exhale.
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They do the exact thing that surgical masks are made to do - capture water droplets that are exhaled when people breath and talk. In surgeries this is to prevent those droplets from contaminating the incision. With COVID 19 it is to prevent other people from inhaling those droplets or having them landing on objects that other people may touch.