Which fire extinguisher classification is used for flammable liquids and gas?

• A. Class B
• B. Class A
• C. Class C
• D. Class D

Answer: (A)

Fires are classified by the type of fuel they involve, and the extinguisher chosen depends on that fuel. For flammable liquids and gases, the extinguisher designed to tackle those fuels is used. Class B extinguishers are meant for fires involving flammable liquids (like gasoline, oils, solvents) and many gaseous fuels, and they work by limiting the flame through smothering or chemical inhibition. That makes them the best match for liquids and gases. Other classes cover different fuels—ordinary combustibles such as wood and paper, energized electrical equipment, and reactive metals—so they wouldn’t be appropriate for liquids and gases.