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Foam Stored Pressure Fire Extinguisher Introduction The fire extinguisher is a portable device used to put out fires of limited size. Such fires are grouped into four classes, according to the type of material that is burning. Class A fires include those in which ordinary combustibles such as wood, cloth, and paper are burning. Class B fires are those in which flammable liquids, oils, and grease are burning. Class C fires are those involving live …

…A or B fire involving combustibles (such as wood, cloth, or paper) or liquids (such as oil or grease) the foam fire extinguisher is very useful. In an operating cycle, the fire extinguisher is picked up and held by the solid handle. After the safety pin is removed, the operating handle is depressed, allowing the foam inside the metal container to flow up the siphon tube and out of the hose to extinguish the fire.