Which class of fire includes ordinary combustibles such as wood and paper?

Class A fires are those that involve ordinary combustibles such as wood, paper, cloth, rubber, and many plastics. These materials are commonly found in residential and commercial settings and are characterized by their ability to burn steadily when ignited. The classification is based on the material involved in the fire, where Class A specifically designates these common combustibles.

The extinguishing agents appropriate for Class A fires typically include water and certain foam types, which cool the burning material and help to eliminate the heat element of the fire triangle. Understanding this classification is essential for firefighters as it guides them in choosing the correct methods and equipment to effectively manage and extinguish the fire.

In this context, the other classifications do not pertain to ordinary combustibles. Class C fires involve flammable gases and electrical equipment, Type I often refers to construction classifications involving non-combustible materials, and Type III pertains to a specific construction type, primarily in relation to building codes and not fire behavior.