3M 4251+ Maintenance Free Gas/Vapour and Particulate Respirator3M Maintenance Free Half Mask 4251+ is a simple and ready-to-use respirator with an integrated cartridge and filters. A newly enhanced valve assembly helps to reduce exhalation breathing resistance, and the close-fitting, non-silicone, textured face seal is soft and non-allergenic. Includes a resealable bag for hygienic storage and transportation. Effective and comfortable protection against organic vapour and hazardous particulates, A newly enhanced valve assembly helps to reduce exhalation breathing resistance for improved breathing comfort, Lightweight, well-balanced, low profile design, Integrated cartridge and filters mean its ready to use and maintenance free, Soft, close-fitting face seal made with textured, non-allergenic material, Adjustable head cradle and easy to fasten neck straps, Centrally-positioned exhalation valve helps reduce heat and moisture build-up in hot and humid conditions, FFA1P2 R D protects again