Which type of fire extinguisher is labeled with a class B?

A fire extinguisher labeled with a class B is specifically designed for flammable liquids, which includes substances like gasoline, oil, grease, and solvents. The distinguishing characteristic of class B is its effectiveness in combating fires fueled by these types of liquids, which can produce volatile vapors and are typically more challenging to extinguish. Class B fire extinguishers use agents such as foam, dry chemical, or carbon dioxide to smother the flames and prevent re-ignition.

Understanding the classification system for fire extinguishers is crucial for safety in industrial settings and other environments. These classifications help ensure that the appropriate extinguisher is readily available based on the types of materials that may ignite. For example, while the other options mention extinguishers designed for electrical fires, ordinary combustibles, or kitchen fires, they correspond to other classes. Class A extinguishers address ordinary combustibles, class C extinguishers are for electrical fires, and kitchen fires usually are covered under class K extinguishers, which are specifically tailored for cooking oils and fats.