Invention relates to a fire suppressing gas generating device. The device comprises a housing (1) with an array of discharge openings (2). The device further comprises a plurality of gas- generating grains (4) disposed within the housing (1); a multi-layer filter (5); an ignition device (6) associated with the gas generating grains (4) for ignition of said the gas-generating grains (4); and a foil section (7) disposed over said discharge openings (2).