Foam AFFF extinguishers are suitable for which fire classes?

• A. Foam AFFF
• B. Water
• C. Carbon Dioxide
• D. Wet Chemical

Answer: (A)

Foam AFFF extinguishers are designed to handle fires involving ordinary combustibles and flammable liquids. The foam forms a stable blanket that cools the fuel and, crucially, separates the fuel from the air, which smothers the flame and helps prevent reignition. This combination makes them effective for Class A fires (solids like wood and paper) and Class B fires (flammable liquids like gasoline and solvents). They are not the right choice for live electrical equipment (Class C) without a specific electrical rating, nor for metal fires (Class D) or specialized cooking fires that require wet chemical agents. So this extinguisher type is associated with both solid and liquid fuel fires, which is why it’s the correct choice for this question.