Which fire extinguisher class indicates that it is meant for use on paper and wood fires?

The class of fire extinguisher designated for use on fires involving ordinary combustibles such as paper, wood, and cloth is class A. This classification is based on the types of materials that catch fire and how they behave when ignited.

Class A extinguishers are specifically designed to combat fires that originate from solid materials, with water being the most commonly used extinguishing agent for this class. These fires are characterized by their ability to leave ash when they burn, which is why they are grouped together.

This distinguishes class A from other classes, such as class B, which is meant for flammable liquids, class C for electrical fires, and class D for combustible metals. Each class is formulated to address specific fire types and using the wrong type could be dangerous and ineffective. Therefore, understanding the nature of the fire and the materials involved is crucial for the effective use of fire extinguishers.