Class B fires typically involve which of the following substances?

Class B fires involve flammable liquids and gases, which are typically characterized by their ability to ignite and burn. These substances include greases, oils, and certain chemicals. The presence of these materials contributes to the risk of a fire that can spread quickly and require specific types of extinguishing agents that are suitable for Class B fire scenarios.

The focus on greases and oils highlights the common situations where Class B fires occur, such as in kitchens or industrial settings where flammable liquids are present. This classification aligns with the guidelines provided in the NFPA standards, emphasizing the need for proper fire extinguishing methods tailored to the type of fuel involved in the fire. Understanding this classification is vital for effective fire response and prevention measures.