Which class of fire involves combustible metals?

Combustible metals are classified under Class D fires, which specifically involve materials such as magnesium, titanium, sodium, and potassium. This classification is essential for effective fire suppression because these types of metals can react violently with water and air, making conventional extinguishing methods inappropriate. Class D fire extinguishers typically use dry powder agents that smother the fire and do not react with the burning metal. Understanding this classification is crucial for firefighters to ensure they use the correct firefighting methods and agents when responding to incidents involving combustible metals.