3M Particulate Respirator w/Cool Flow Exhalation N95 Part No. 3M8511 10 per box Uniquely designed to help provide protection against non-oil-based particles and ideally suited for work settings that involve heat, humidity or long periods of wear. Patented, one-way 3M Cool Flow™ Exhalation Valve helps reduce heat and moisture buildup inside the respirator for increased comfort. Adjustable M-noseclip helps provide a custom fit and secure seal. Meets NIOSH 42 CFR 84 N95 requirements.