The colored background for a _____ extinguisher is a red square.

The colored background for a _____ extinguisher is a red square.

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

Answer: (D)

Understanding extinguisher color codes helps you quickly match the device to the fire type it can fight. In this system, the background shape and its color indicate the class of fire. A red square background signals Class B, which covers fires involving flammable liquids like gasoline, oil, or solvents. That association is why the red square is the mark for a Class B extinguisher. For context, Class A uses a green triangle, Class C uses a blue circle, and Class D uses a yellow pentagon. These shapes and colors are designed to be easy to recognize at a glance so you can choose the right extinguisher in an emergency.

Understanding extinguisher color codes helps you quickly match the device to the fire type it can fight. In this system, the background shape and its color indicate the class of fire. A red square background signals Class B, which covers fires involving flammable liquids like gasoline, oil, or solvents. That association is why the red square is the mark for a Class B extinguisher.

For context, Class A uses a green triangle, Class C uses a blue circle, and Class D uses a yellow pentagon. These shapes and colors are designed to be easy to recognize at a glance so you can choose the right extinguisher in an emergency.