All APO buildings are equipped with one or more types of fire extinguishers. In addition, all buildings have fire alarm systems. ... There are four classes of fires based generally on the fuel but in one case, on the ignition source, and four corresponding classes of extinguishers. ... Water Pressure, Fire Hose - Since no pressurized water fire extinguishers exist on site, the external hoses and fire pump/storage tank make up the local source of water for fire fighting. ... BUILDING FIRE . ...