[crz]

THEE ONLY thing that would be a sure thing for filtering out that bug is a military gas mask.

[Socon-Econ]

THEE ONLY thing that would be a sure thing for filtering out that bug is a military gas mask.
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True enough; but even if the common mask worked for fabric filtering, you can’t get the air you need by trying to breath thru it alone, so air has to flow around the edge of the mask.