What type of fire extinguisher should be used on a Class A fire?

A Class A fire involves ordinary combustibles such as wood, paper, cloth, and some plastics. The most effective extinguishing agent for these types of materials is water, as it cools the burning material and removes heat from the fire. Water-based fire extinguishers are specifically designed to combat Class A fires by penetrating the fuel and extinguishing the flames.

Using water helps to douse the burning material, preventing re-ignition. It's essential to use the correct type of extinguisher because using the wrong type may not effectively extinguish the fire and could even exacerbate the situation. For example, using a foam-based extinguisher, while it can be effective for Class A fires, is typically more suited for flammable liquid fires (Class B) and might not be as efficient for ordinary combustibles.

Dried chemical and carbon dioxide extinguishers have their own specific uses that do not always align with the extinguishing needs of a Class A fire. While these may put out certain types of fires, the direct cooling action of water is what makes water-based extinguishers the preferred choice for Class A fires.