Which type of fire extinguisher is used for ordinary combustibles such as wood and paper?

The correct answer is Class A fire extinguishers, which are specifically designed to combat fires involving ordinary combustibles such as wood, paper, cloth, and some types of rubber. These materials ignite and burn easily, and the Class A extinguishers are effective because they use water or foam to cool the burning materials and remove the heat, which is essential for extinguishing the fire.

Class A extinguishers typically contain water, which can effectively cool the flames and prevent re-ignition as it absorbs heat. They also often contain additives that enhance the extinguishing capabilities, making them suitable for everyday household and office fires involving common materials.

Understanding the classification of fire extinguishers is crucial for effective fire response and safety. Each class addresses specific types of fires, so knowing that Class A is aimed at ordinary combustibles helps make informed decisions during an emergency.