If you see a green triangle symbol on an extinguisher, which Class is it for?

If you see a green triangle symbol on an extinguisher, which Class is it for?

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

Answer: (D)

Symbols on extinguishers use shapes and colors to indicate which fire types they’re suitable for. A green triangle identifies Class A fires, which involve ordinary combustibles like wood, paper, or cloth. The triangle shape is the marker used for Class A, and the green color helps you quickly spot it in training and on equipment. Extinguishers for Class A work by removing heat, typically through a water-based agent, so they’re effective on those kinds of fires. Other classes use different shapes and colors—fires involving flammable liquids, electrical equipment, or metals are represented with other symbols—so the triangle is a clear sign that the extinguisher is intended for ordinary combustibles.