What is a characteristic of Class B fire extinguishers?

Answer: B — They are designed for flammable liquids

Class B fire extinguishers are specifically designed to combat fires involving flammable liquids, such as gasoline, oil, grease, and other petroleum-based substances. This classification is crucial because these types of fires require different extinguishing agents compared to those needed for other classes of fires. For instance, using water on a Class B fire can worsen the situation, as it could spread the flammable liquid. Instead, Class B extinguishers utilize agents like foam, carbon dioxide, or dry chemical powders that can effectively smother the fire and prevent further ignition. Understanding the proper use of a Class B extinguisher is critical for safety and fire prevention in environments where flammable liquids are present.