Do class a fire extinguishers put out oxygen heat or fuel?

Class A fire extinguishers are designed to put out fires involving ordinary combustible materials such as wood, paper, and textiles. They work by cooling the burning material to remove heat, which is one of the three elements of the fire triangle (heat, fuel, and oxygen). While they do not directly remove oxygen or fuel, by extinguishing the heat, they effectively prevent the fire from continuing to burn.