If you discover a pile of empty cardboard boxes burning, which fire extinguisher should you choose?

Choosing a multi-purpose dry chemical extinguisher is the correct option for extinguishing a fire involving cardboard boxes. This type of extinguisher is effective because it can combat Class A fires, which include ordinary combustibles such as wood, paper, and cardboard.

Multi-purpose dry chemical extinguishers typically contain chemicals, such as sodium bicarbonate or monoammonium phosphate, which work to smother the fire by creating a barrier between the fuel and the oxygen it needs to burn. This makes them suitable for a range of materials, including those commonly made of cardboard.

While other extinguishers, such as dry-powder or Halon, may work in specific situations, they are not as versatile for general use against Class A fires. The ordinary dry chemical may also be effective, but the term "multi-purpose" indicates a broader range of effectiveness against different types of fires, making it a more reliable choice for this scenario. Understanding the types of fires and the appropriate extinguishing agents is crucial for ensuring safety when faced with such situations.