This type of extinguishing is provided by the use of high-expansion foams in combination with foam generators. High expansion foam system is mostly used in full volume applications. There should be architectural limitations in the applied area. It is mostly applied in cable tunnels, aircraft hangars, mine shafts, underground parking lots, tire depots, hazardous materials depots, flammable liquid depots, engine test cells, basements, paper depots and ship hangars.