A fire suppression apparatus, the apparatus comprising: a generally cylindrical, tubular elongated housing ; a gas generator section including a gas generator including a first chamber between a base end wall and a header end wall , the first chamber subdivided to include at least a first subchamber and a second subchamber ; a quantity of an ignition material contained in the first subchamber ; a quantity of gas generant material contained in the second subchamber and housed within gas generant containers , gas generant containers each generally including an elongated, perforated cylindrical tube having a plurality of gas generant material wafers disposed between first and second end walls ; an initiator operatively associated with the first subchamber and initiating communication with at least a portion of the quantity of the ignition material when in reaction therewith; a central chamber in communication with an interior of the gas generator through openings in the header end wall and further comprising exit ports ; a second chamber adjacently disposed to the first chamber at least in part including a diffuser section and a sealed storage reservoir containing a quantity of liquid coolant material ; a piston assembly including a piston having openings therein and in peripheral sealing contact with a mouth of storage reservoir , an interior of piston forming a mixing chamber ; and a third chamber generally disposed externally about the second chamber ; wherein responsive to gas formed by combustion of gas generant material in communication with piston through openings and exit ports , piston is movable to expel at least a portion of the quantity of coolant material from the storage reservoir through openings into mixing chamber to contact and cool the gas formed by the ignition of the gas generant material , the contacted and cooled gas enabled to exit the second chamber through openings of the diffuser section into third chamber and to exit third chamber through at least one discharge opening of housing . a gas generator section including a gas generator including a first chamber between a base end wall and a header end wall , the first chamber subdivided to include at least a first subchamber and a second subchamber ; a quantity of an ignition material contained in the first subchamber ; a quantity of gas generant material contained in the second subchamber and housed within gas generant containers , gas generant containers each generally including an elongated, perforated cylindrical tube having a plurality of gas generant material wafers disposed between first and second end walls ; an initiator operatively associated with the first subchamber and initiating communication with at least a portion of the quantity of the ignition material when in reaction therewith; a central chamber in communication with an interior of the gas generator through openings in the header end wall and further comprising exit ports ; a second chamber adjacently disposed to the first chamber at least in part including a diffuser section and a sealed storage reservoir containing a quantity of liquid coolant material ; a piston assembly including a piston having openings therein and in peripheral sealing contact with a mouth of storage reservoir , an interior of piston forming a mixing chamber ; and a third chamber generally disposed externally about the second chamber ; wherein responsive to gas formed by combustion of gas generant material in communication with piston through openings and exit ports , piston is movable to expel at least a portion of the quantity of coolant material from the storage reservoir through openings into mixing chamber to contact and cool the gas formed by the ignition of the gas generant material , the contacted and cooled gas enabled to exit the second chamber through openings of the diffuser section into third chamber and to exit third chamber through at least one discharge opening of housing . <EOS>