Extinguishers suitable for Class D fires are identified by a symbol containing the letter D.

Extinguishers suitable for Class D fires are identified by a symbol containing the letter D.

• A. Blue circle
• B. Yellow star
• C. Green triangle
• D. Red square

Answer: (B)

Metal fires require a specific identification on extinguishers, a symbol that includes the letter D. That symbol is the yellow star, which signals extinguishers designed for Class D fires involving combustible metals like magnesium or titanium. The other shapes correspond to different fire classes—green triangle for ordinary combustibles, red square for flammable liquids, and blue circle for energized electrical fires—so the yellow star uniquely indicates metal-fire extinguishers.

Metal fires require a specific identification on extinguishers, a symbol that includes the letter D. That symbol is the yellow star, which signals extinguishers designed for Class D fires involving combustible metals like magnesium or titanium. The other shapes correspond to different fire classes—green triangle for ordinary combustibles, red square for flammable liquids, and blue circle for energized electrical fires—so the yellow star uniquely indicates metal-fire extinguishers.