Which type of fire extinguisher is typically used for Class A fires?

The use of water extinguishers for Class A fires is based on the nature of these fires, which involve ordinary combustible materials such as wood, paper, cloth, and some types of trash. Water extinguishers are effective because they cool the burning material below its ignition temperature, thereby extinguishing the fire.

Water's high heat capacity allows it to absorb a significant amount of heat before it turns to steam, making it particularly suited for the types of materials involved in Class A fires. When applied, water helps to suppress the flames and reduces the risk of rekindling.

Other extinguisher types, although useful in certain scenarios, may not be as effective for Class A fires. Dry chemical extinguishers work across different classes but are most beneficial for flammable liquids and electrical fires. CO2 extinguishers are designed primarily for electrical and flammable liquid fires. Foam extinguishers can work on Class A and B fires, but they are more specialized and are not exclusively designed for the everyday solid combustibles found in Class A fires. Thus, water stands out as the most appropriate choice for effectively dealing with Class A fire situations.