This device can form a fixed (or semi-fixed) foam fire extinguishing system with fire pump (or fire truck), foam generation and spray equipment (see the figure below). It is widely used in extinguishing Class A (except for liquefied hydrocarbon), Class B and Class C liquid fires. It is the most commonly used fire-fighting equipment in oil depots, solid material warehouses, flammable liquid warehouses, boiler rooms, underground construction projects, cabins, gas stations, chemical plants, hangars, docks, underground garages, and dangerous goods warehouses.