Common woodworking dust masks with the exhallation vents: are they safe?
Sure they do a fine job of protecting you from anything you might inhale, but by principle they do not protect anyone else. On exhallation its like you have a giant hole in your mask, rendering the equiptment useless in fighting the spread of anything the wearer might be carrying.
The answer is obviously a no: they are not safe and should be banned in social distancing situations.
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source https://www.reddit.com/r/conspiracytheories/comments/hxdk1d/common_woodworking_dust_masks_with_the/
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