Part of our Pro Series, the 3M Cool Flow Valve Particulate Respirator 8511 is designed with the pro in mind to help bring you protection and comfort. The Cool Flow Exhalation Valve helps release warm and moist exhaled breath from inside the respirator. This N95 respirator features Advanced Electrostatic Media that enhances the capture of airborne particles and is designed for easy breathing. An adjustable M-noseclip helps provide a custom, secure seal. Whether you're hanging drywall or sanding a floor, rely on the trusted protection of the 3M Cool Flow Valve Particulate Respirator 8511. From the Manufacturer 3M Tekk Protection 10 Pack Respirator Cool Valve Filtering Facepiece Particulate Respirator N95 Lightweight Comfortable "M" Nose Clip Recommended For Sanding & Preparation Before Painting NIOSH Approved: N95.