The Drager combination filter 1140 A1B2E2K1HgNO CO 20 P3 R D offers clean breathing air and protection against a wide range of gases. The list of gases covered by the filters includes organic compounds, inorganic compounds (e.g. chlorine, hydrogen sulphide, and hydrogen cyanide), sulphur dioxide, hydrogen chloride, ammonia, mercury vapour, nitrous gases and also carbon monoxide. Tough aluminium housing offers additional protection. Optimum protection is offered through individual packaging. Shelf life (from date of production) is 6 years.