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.