Which fire classification refers to fires involving combustible metals?

Fires involving combustible metals are classified as Class D fires. This classification is specifically designed for fires that involve reactive metals such as magnesium, titanium, and sodium. These metals can burn at extremely high temperatures and can react violently with water and other substances, necessitating specialized extinguishing agents and techniques to effectively manage and extinguish the fire.

In contrast, Class A fires involve ordinary combustible materials like wood and paper, Class B fires involve flammable liquids and gases, and Class C fires are associated with electrical equipment. The distinctions among these classifications are crucial for determining the appropriate firefighting methods and materials to use, ensuring effective and safe responses to different types of fires.