Which extinguisher class is used for flammable liquids?

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

Answer: (B)

Fires involving flammable liquids require extinguishing methods that cut off the fuel’s access to the flame and reduce the heat or vapors that keep the fire going. Extinguishers labeled for flammable liquids are designed to do exactly that, making them the appropriate choice for these fires. They smother or separate the fuel from the air and/or cool the liquid to below its ignition temperature, helping prevent reignition.

For context, extinguishers labeled for ordinary combustibles address materials like wood and paper; those for energized electrical fires (Class C) are non-conductive and designed to avoid energizing equipment; and Class K is specialized for commercial kitchens with cooking oils.

So, for flammable liquids, use the extinguisher designed for that purpose.