if this works, doesn't this imply a lot of the exhaled breath is unfiltered?https://twitter.com/MDiPaolaMD/status/1293311712507166720 …
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Thanks for the reference!
Thanks. Twitter will use this to make your timeline better. UndoUndo
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This mask also has unfiltered exhale air due to the valve in the middle.
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Is that right, Danielle?
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