🔍 Key Concepts

• Aqueous Film Forming Foam (AFFF) properties and how it works on flammable liquids • Differences between Class B, Class C, and Class D fires • Why water-based agents may or may not be safe around electrical or metal fires

💭 Think About

• Think about what happens when AFFF spreads over a burning liquid surface. What kind of fires involve burning liquids that can be blanketed? • Consider whether a water-based foam is appropriate for burning metals or energized electrical equipment. • Ask yourself: is there any fire class in the choices where adding water or water-based foam would actually be dangerous or ineffective?

✅ Before You Answer

• Verify which fire class involves flammable liquids such as fuel oil and gasoline. • Check whether Class D (metal) fires are normally fought with specialized dry powders, not water-based agents. • Confirm if Class C fires (energized electrical equipment) are generally compatible with water or water-based foams like AFFF.