Patent ID: 7975773

Claim:
A high expansion foam fire-extinguishing system provided in an enclosed space, the high expansion foam fire-extinguishing system comprising; a supply of foam solution prepared by mixing water with a foam concentrate containing a surface active agent; an emission nozzle to which the foam solution is supplied under pressure; a flow passage containing the emission nozzle for sucking in air in the enclosed space including smoke generated as a result of generation of a fire by discharging the foam solution from the emission nozzle; and a foam screen which is provided in the flow passage and upon which the foam solution discharged from the emission nozzle impinges, wherein the foam concentrate comprises an aqueous film forming foam concentrate containing a fluorinated surfactant, and the foam concentrate used has a mixing ratio of the aqueous film forming foam concentrate with respect to the foam solution of 4% or more, and a content rate of the fluorinated surfactant with respect to the aqueous film forming foam concentrate of 10% or more, and wherein a mixing ratio of the surface active agent with respect to the foam solution is 0.4% or more, so as to obtain a high expansion foam having a foam expansion ratio of 240 or more.