Trifluorobromomethane foam fire fighting system

Claim 1

Apparatus for fighting fires comprising, in combination: means for supplying an aqueous liquid under pressure to a discharge opening; nozzle means at said discharge opening, said nozzle means having a discharge orifice and, upstream therefrom, an air induction opening around the periphery of said nozzle means; metering means supported around said air induction opening, said metering means comprising an annular metering collar having spaced around the annulus thereof a plurality of metering nozzles whose output is directed into said air induction opening, said metering means passing a trifluorobromomethane (CF 3 Br) compound from a supply receptacle under pressure into said aqueous liquid such that said mixed liquid and said compound are projected as a foam onto a fire from said nozzle means, the trifluorobromomethane compound mixed in said liquid expanding upon passage through said nozzle means to generate a gas in the bubbles of said foam whereby said compound is carried in said bubbles to said fire by said foam such that the subsequent bursting of said bubbles releases said compound to act on said fire and thereby further the fire extinguishing action of said foam.