3M 4251+ Maintenance Free Gas/Vapour and Particulate Respirator 3M 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 It is 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 against organic vapours, with a boiling point greater than 65 C, up to 10 x Workplace Exposure Limit (WEL) or 1000 ppm (whichever is lower), and 10 x WEL for particulates, Includes a resealable bag for hygienic storage and transportation, EN 405:2001+A1:2009.