Which symbol identifies Class B extinguishers (color and shape)?

Which symbol identifies Class B extinguishers (color and shape)?

• A. Green triangle A
• B. Blue circle C
• C. Red square B
• D. Black hexagon K

Answer: (C)

Understanding extinguisher labeling: the symbol’s color and shape together tell you what class of fire the extinguisher is designed for. A red color signals flammable liquids, and the square shape differentiates this class from the others. So the symbol that uses a red square identifies Class B extinguishers, which are used on fires involving flammable liquids like gasoline, oil, and solvents. The green triangle corresponds to ordinary combustibles (Class A), the blue circle to electrical fires (Class C), and the black hexagon to cooking oils (Class K).

Understanding extinguisher labeling: the symbol’s color and shape together tell you what class of fire the extinguisher is designed for. A red color signals flammable liquids, and the square shape differentiates this class from the others. So the symbol that uses a red square identifies Class B extinguishers, which are used on fires involving flammable liquids like gasoline, oil, and solvents. The green triangle corresponds to ordinary combustibles (Class A), the blue circle to electrical fires (Class C), and the black hexagon to cooking oils (Class K).