Patent ID: 8813860

Claim:
A fire fighting system for extinguishing a fire source in a room, the fire fighting system comprising: a fuel cell for producing a nitrogen-enriched cathode exhaust air, the fuel cell having a cathode and an anode; and a conduit assembly for supplying the nitrogen-enriched cathode exhaust air to the fire source to reduce an oxygen content around the fire source, such that the fire source is extinguished, an air supply of the fuel cell supplying external air from outside the room to the cathode of the fuel cell; a conduit measurement unit measuring at least one of the oxygen content and the hydrogen content of the exhaust air in the conduit assembly; wherein the system is configured to adjust a lambda value of the cathode by regulating an air supply of the fuel cell based at least on the output of the conduit measurement unit, thereby controlling the oxygen content of the room; wherein the lambda value represents the ratio between the oxygen amount supplied to the fuel cell and the oxygen amount converted inside the fuel cell; and wherein the cathode exhaust air has a lower oxygen content and a higher nitrogen content than the air supply from outside the room to the cathode of the fuel cell.