This invention relates to an improved portable system for the delivery of
a breathable, fire extinguishing gas mixture to a fire zone. The gas
mixture comprises a normally gaseous inert material, such as nitrogen,
helium or argon; an oxygen containing gas; and carbon dioxide. The system
includes a means for storing or generating the inert material, means for
storing the carbon dioxide, means for generating or introducing the
oxygen containing gas, and means for mixing the components. The system
also includes means for heating, vaporizing and controlling the
temperature and proportions of the components.