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Fire extinguishers designed for normal trash, such as paper or wood, are classified as Class A extinguishers. This classification is specifically designated for ordinary combustibles, which predominantly includes materials that ignite easily and can be extinguished with water or similar methods.

Class A extinguishers effectively combat fires involving solid materials, making them suitable for situations where common waste products, like paper and wood, catch fire. The use of water or foam agents with Class A extinguishers is effective due to their ability to cool the burning material and eliminate the heat element of the fire triangle.

In contrast, the other classes of fire extinguishers are not appropriate for ordinary combustibles: Class B extinguishers are meant for flammable liquids, Class C extinguishers target electrical fires, and Class D extinguishers are specifically designed for combustible metals. Each class has its own specific usage criteria based on the nature of the materials involved in the fire, underscoring the importance of using the correct type of extinguisher for a given situation.