Provides a minimum of 99.97% filter efficiency against solid and non-oil based aerosol particulates for excellent worker protection. It features the 3M™ Cool Flow™ Exhalation Valve which is the patented one-way valve offering easy exhalation for cooler dry comfort. The uniquely designed filter layers contribute to the reduction of particles clogging the filter surface which translates into greater user comfort, longer service life and increased savings to you. The foam faceseal contours easily to help provide a good seal for a comfortable wear. Adjustable noseclip and head a strap provides custom fit and secure seal reducing the potential for eyewear fogging. Work applications include welding, soldering, brazing, torch cutting, metal pouring and pharmaceutical manufacturing. NIOSH Approved. 20 per case. Sold by the each.