3M 8511 Series Respirator 30-Pack This popular respirator can take a week or two to ship. Explore Filtera's other filtration offerings. Next to Availability, click on "from Filtera". On the next page, click on "Filtera Storefront." Add our storefront page to your Favorites. 3M Model 8511 is rated as an N95 respirator (N95 is not oil resistant, is 95% efficient to 0.3 micron particle sizes) 3Ms patented Cool Flow Exhalation Valve is positioned for cool, easy breathing.