Kidde Fire Extinguisher - There are four classes of fire extinguishers. Each one is designed for a specific type of fire. Modern fire extinguishers use a picture and labeling system to designate which types of fires they are designed for. Older units use colored geometrical shapes with letter designations.

Class A and B fire extinguishers have a numerical rating based on tests conducted by Underwriter’s Laboratories. These ratings determine the extinguishing potential for each size and type of extinguisher.

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.