Portable Fire Extinguisher - Fire extinguishers come in four different classes. Each class is designed to fight a different kind of fire. Class A and B extinguishers have a numerical rating that determine the extinguishing potential based on size and type.

Class A Extinguishers will put out fires in ordinary combustibles such as wood and paper. The numerical rating refers to the amount of water the fire extinguisher holds and the amount of fire it is designed to extinguish.

Class B Extinguishers are used on fires involving flammable liquids like grease, gasoline, oil, etc. The numerical rating states the approximate number of square feet of a flammable liquid fire that can be extinguished.