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I have used the 8511's for many years they are well priced and good quality, the do not fog up my glasses because of the built in air escape valve and Amazon shipped it quickly,
This is great thing I have ever wear a mask. That good. You should use this mask all the time.
Because it fits tightly against my neck/chin area, I don't think this lets in any particulate matter. Nice and soft, easy to use; however, the fit would be better if the bottom was shortened. The mask itself is very good. As it is, it presses uncomfortably on area between neck and chin. It seems to be very effective. To remedy this I've cut off about a half inch along the bottom.
Well, I got the flu. I should have thought harder about what a "valve" meant, but I was just going off the comfortablility claims rather than what that actually meant. Not exactly effective in preventing my germs from getting out in the open when I cough. We had these in case one of us got sick with H1N1 and we had to prevent the other one from getting sick. We bought these because of the "easy to wear for long periods of time" claim. I believe they added the "Sanding" description sometime after I bought it last spring.I could understand how they would work well in wood working, but in the virus area, get a traditional N95 without the valve. However, we didn't realize that the "valve" was actually a flap that opens when you exhale.
I've tried several other models including 3Ms model 8210 and had problems with them fogging up my glasses. Also more comfortable than other respirators that I have tried. These reduce the fogging by 90% or more.
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