I'm not certain if this applies to this particular design, but I read that masks with valves filter inward, but do not filter outgoing air. AKA they are good for personal health, but do not protect others very well (which is the larger point, I think)
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I did not do my homework here, but this was the tweet that put the thought in my head:https://twitter.com/chagmed/status/1243605973685751808?s=20 …
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