What is the classification rating for a fire extinguisher designed to handle heptane fires in square pans?

A fire extinguisher designed to handle heptane fires is classified under Class B. Class B extinguishers are specifically intended for flammable liquids such as gasoline, oil, grease, and other hydrocarbons, which include substances like heptane. When heptane burns, it can produce significant flames and heat, making it essential to use an appropriate Class B extinguisher that can effectively smother the flames and prevent re-ignition.

In fire classification, Class A is for ordinary combustibles like wood and paper, Class C is for electrical fires, and Class D is for combustible metals. Since heptane is a flammable liquid, it does not fall under the other classifications, reinforcing the necessity of using a Class B extinguisher for this type of fire. This targeted approach ensures that the fire is effectively contained and extinguished.