I just ran across a mask effectiveness video you may find interesting.
It's not one of those lab coat/goggles professional type ones. This one
is aimed at a more blue collar audience and definitely gets the point
across.
It's not something you would do for a class demo. See how many safety
issues you can find.
https://www.youtube.com/watch?v=x6cTDGqcUpA
Cheers!
Dave Lane
Principal
Clavis Technology Development
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