3M™ 8511 N95 Particulate Respirator is NIOSH certified to have at least 95% filter efficiency at removing solid and liquid particles (excluding those containing oil). The innovative "M" nose clip helps provide a good faceseal. The 3M™ Cool Flow™ Exhalation Valve reduces heat and humidity build-up inside the respirator for added comfort. 10 per box. Meets 42 CFR84 standard.