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Class A fires are those that involve ordinary combustible materials such as paper, wood, and cardboard. This classification is specified because these materials are common in many environments such as homes and offices. In a Class A fire, these substances can ignite and burn, producing ash as a residue once the fire is extinguished. The fire extinguishing agents typically effective against Class A fires include water, foam, and certain dry chemicals, which help cool the fire and suppress it.

The other types of fires mentioned are classified differently. Electrical fires fall under a different category due to the presence of electrical equipment, while flammable liquid fires are classified as Class B, as they involve materials like gasoline, oil, and solvents. Metal fires, on the other hand, are classified as Class D, which are specific to combustible metals that react differently than organic materials. Understanding these classifications is crucial for selecting the appropriate fire extinguishing methods and ensuring safety in case of a fire emergency.