Extinguisher, Foam, Chemical : A fire extinguisher from which chemical foam is expelled when the chemical solutions, stored separately within the body of the extinguisher, are allowed to mix and react. (BS 4422(4))
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}