Premium respirator for use with welding fumes, the 2310N99 features an exhalation valve that reduces hot-air build-up. Collapse-resistant Dura-Mesh® shell lasts longer so workers use fewer masks. Flame-retardants added to help decrease flammability of shell. Shaped for comfort with contour molded nose-bridge. Seals easily and comfortably without a metal noseband. Certified under NIOSH 42CFR84 to have filter efficiency level of 95% or greater against particulate aerosols free of oil. Sold 10 per bag.