Class D extinguishers are designed for fires involving which materials?

Class D extinguishers are designed for fires involving which materials?

• A. Cooking, Greases, Fats, Oils
• B. Combustible Metals
• C. Electrical Equipment
• D. Ordinary Combustibles

Answer: (B)

Fires with metal fuels need a different extinguishing approach because metals burn at high temperatures and can react violently with water. Class D extinguishers are designed for combustible metals and use dry powder agents that smother the flame and absorb heat without reacting with the metal. They’re effective on metals such as magnesium, titanium, aluminum, sodium, and potassium. Spraying water on metal fires can cause dangerous reactions or splatter, and standard extinguishers for other classes won’t work well. The other options describe fuels that belong to different fire classes: cooking greases and oils are managed with extinguishing agents for cooking fires; electrical equipment fires use agents suited for energized systems; ordinary combustibles are those like wood and paper. So the best answer is extinguishing fires involving combustible metals.

Fires with metal fuels need a different extinguishing approach because metals burn at high temperatures and can react violently with water. Class D extinguishers are designed for combustible metals and use dry powder agents that smother the flame and absorb heat without reacting with the metal. They’re effective on metals such as magnesium, titanium, aluminum, sodium, and potassium. Spraying water on metal fires can cause dangerous reactions or splatter, and standard extinguishers for other classes won’t work well. The other options describe fuels that belong to different fire classes: cooking greases and oils are managed with extinguishing agents for cooking fires; electrical equipment fires use agents suited for energized systems; ordinary combustibles are those like wood and paper. So the best answer is extinguishing fires involving combustible metals.