Home Builders Institute Pre-Apprenticeship Certificate Training (HBI-PACT) Practice Test

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Which type of fire is characterized by the combustion of metals?

  1. Class A

  2. Class B

  3. Class C

  4. Class D

The correct answer is: Class D

The type of fire characterized by the combustion of metals is classified as Class D. Class D fires typically involve combustible metals such as magnesium, titanium, aluminum, and sodium. They require special extinguishing agents, as traditional methods like water can exacerbate the situation. Class D fire extinguishers are specifically designed for this purpose and often contain dry powder agents that smother the fire by separating the fuel from the oxygen or by forming a protective layer over the metal. Understanding Class D fires is crucial for safety in environments where these materials are handled or stored, as they present unique challenges compared to other fire classes.

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