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Fire extinguishers are divided into five categories -- class A, B, C, D, and K. Each one is used on different types of fires. Each fire extinguisher also has a numerical rating that serves as a guide for the amount of fire the extinguisher can handle. The higher the number, the more fire-fighting power. The ABC extinguisher is the most common type for general use. It is important to know what type of extinguisher you are using and how to use it properly. As a general rule, remember PASS to use a fire extinguisher- P-pull the pin, A-aim at the base of the fire, S-squeeze, and S-sweep from side to side.