Relevant to the comments about fluid resistance: the difference between 3m's medical N95 respirators and construction N95 respirators is often nothing more than

Relevant to the comments about fluid resistance: the difference between 3m's medical N95 respirators and construction N95 respirators is often nothing more than color, being stamped with a lot #, and additional fluid resistance. For example, the 1860 vs 8210. [0] Medical personnel using the construction respirators out of necessity can wear a surgical mask over them, it's something I've seen locally. (I don't know whether that's a practice that predates COVID 19) [0] http://docplayer.net/203020246-N95-tool-kit-algorithms-and-compliance-spectrum-health-contact-steve-mogridge-and-brent-petersen-highlight-denotes-new-content.html http://docplayer.net/203020246-N95-tool-kit-algorithms-and-c...