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Twitter Web App : Air coming out of a vs air going in. 12x12x1 3M MERV12 Filters.
Jim Rosenthal David Elfstrom

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Twitter Web App : One recent study compared fit of cloth, procedure and KN95 masks and N95 respirators. doi.org/10.1371/journa…
N95 respirators had average total inward leakage (TIL) of <1%; KN95s (ear loops) had an average 16% TIL. Cloth & procedure masks had TILs from 71% - 44%.