Class D fires require high or low velocity fog extinguisher at extreme range.

Class D fires require high or low velocity fog extinguisher at extreme range.

• A. Water spray
• B. AFFF
• C. High or low velocity fog extinguisher at extreme range
• D. CO2

Answer: (C)

Class D fires involve burning metals and are best tackled by blanket-style application that interrupts the metal’s burning process without splashing or driving burning particles around. Using a fog pattern—whether high-velocity or low-velocity—from a safe, extended range lets you cover the burning metal surface with extinguishing agent while staying out of the hottest zones. This stand-off and dispersal help suppress the oxidation reaction more effectively than a straight stream, and it reduces the risk of re-ignition as the metal heat is absorbed and the fuel surface is coated. Water spray, AFFF foam, and CO2 are not suitable for metal fires because they don’t reliably stop the metal’s combustion and can even exacerbate the situation by reacting with the metal or failing to cool and smother the fire. So, applying a fog extinguishing pattern from extreme range is the approach that aligns with how Class D fires are effectively managed.

Class D fires involve burning metals and are best tackled by blanket-style application that interrupts the metal’s burning process without splashing or driving burning particles around. Using a fog pattern—whether high-velocity or low-velocity—from a safe, extended range lets you cover the burning metal surface with extinguishing agent while staying out of the hottest zones. This stand-off and dispersal help suppress the oxidation reaction more effectively than a straight stream, and it reduces the risk of re-ignition as the metal heat is absorbed and the fuel surface is coated.

Water spray, AFFF foam, and CO2 are not suitable for metal fires because they don’t reliably stop the metal’s combustion and can even exacerbate the situation by reacting with the metal or failing to cool and smother the fire.

So, applying a fog extinguishing pattern from extreme range is the approach that aligns with how Class D fires are effectively managed.