🔍 Key Concepts

• Class D fires and what materials they involve • Why water, steam, or CO2 can be dangerous on certain metal fires • Special-purpose extinguishing agents used for burning metals like magnesium or aluminum

💭 Think About

• First, identify what type of fire a powdered aluminum fire is classified as under firefighting standards. • Think about how aluminum reacts with water, steam, or CO2 at high temperatures—would any of these make the situation worse? • Which agent is specifically designed to smother and absorb heat from burning metals without reacting violently?

✅ Before You Answer

• Confirm that powdered aluminum is a combustible metal, not an ordinary solid fuel like wood or cloth. • Eliminate any agents that could react chemically with hot metal and increase danger (explosion, sparks, or toxic gas). • Identify the option that is purpose-built for metal fires (Class D) rather than for Class A, B, or C fires.