30 Day ABEK1P3 Half Mask by 3M model 4279 supplied in a re-sealable foil bag for storage Suitable for organic vapours, inorganic gases, acid gases plus amonia and particulates. Please refer to the WEL information in the description below This product helps protect against organic vapours ( with good wearing properties and b.pt >65 deg.c ) inorganic gases, acid gases plus amonia and particulates in concentrates up to 10 x Workplace Exposure Limit ( WEL ) or 1000 ppm ( whichever is the lower ) and particulate concentrations up to 10 x WEL for particulates The 3M 4279 FFABEK1P3 R D is a comfortable disposable ready to use and maintenance-free half mask, the 4000 Series uses innovative technology to provide integral construction respirators using twin inhalation valves and parabolic valve to reduce breathing resistance and prevent heat build-up alongside large bonded carbon filters which do away with the need for granule containers. A respirator programme is easier to manage, avoiding operator assembly errors and allowing a respirator to be designated to a specific area, all thanks to a single-piece integral construction. Replace after one month or when damage occurs, as gas filters become saturated or particulate filters clog.