Portable Unit for Making Foam A complete unit for making foam which may be easily carried about by the fireman, is being manufactured in England. The foam compound is carried in a five-gallon tank strapped to the back of the operator. The makers claim that one gallon of the foam compound will produce from five to eight hundred gallons of foam, according to working conditions. From the tank, the compound flows to the branchpipe, where it is mixed with the stream of water. It is said that the nozzle can deliver from 250 to 1,250 gallons of foam per minute. Claims are made that a 400-gallon pumper operating at 120 pounds pressure can supply eight branchpipes each delivering six hundred gallons of foam per minute, thereby producing a total foam output of 5,000 gallons per minute.