Ordinary combustible materials such as wood, paper, and cloth fall under which fire class?

Ordinary combustible materials such as wood, paper, and cloth fall under which fire class?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (A)

Fire classification is based on the type of fuel involved. Ordinary combustibles—wood, paper, and cloth—fall into Class A because they burn to form ash and are driven mainly by heat that can be cooled away. The most effective way to stop these fires is cooling with water, which lowers the temperature of the fuel and prevents further combustion. The other classes cover different fuels: Class B for flammable liquids, Class C for energized electrical equipment, and Class D for combustible metals. So, for the fuels described, the category is Class A.

Fire classification is based on the type of fuel involved. Ordinary combustibles—wood, paper, and cloth—fall into Class A because they burn to form ash and are driven mainly by heat that can be cooled away. The most effective way to stop these fires is cooling with water, which lowers the temperature of the fuel and prevents further combustion. The other classes cover different fuels: Class B for flammable liquids, Class C for energized electrical equipment, and Class D for combustible metals. So, for the fuels described, the category is Class A.