Which type of fire extinguisher should be used on combustibles like paper, cloth, and wood?

The Class A extinguisher is specifically designed for use on ordinary combustibles such as paper, cloth, wood, and various plastics. These materials are commonly encountered in typical environments like homes, offices, and various workplaces. Class A extinguishers work by cooling the burning material and removing the heat necessary for combustion, while also creating a barrier between the fuel and oxygen, which is needed for fire to continue.

In contrast, other classes of extinguishers target different types of fires. Class B extinguishers are meant for flammable liquids such as gasoline, oils, and grease. Class C extinguishers are intended for electrical fires involving energized equipment. Class D extinguishers are specifically designed for metal fires, which are rare and involve flammable metals like magnesium or sodium. Thus, for combustion material where paper, cloth, and wood are a concern, the Class A extinguisher is the appropriate choice.