Which extinguisher is associated with Class A and B?

• A. Multipurpose dry chemical Agent
• B. Water Extinguishing Agent
• C. Foam AFFF Extinguishing Agent
• D. Ordinary Dry Chemical Extinguishing Agent

Answer: (D)

Understanding extinguisher types and the classes they cover helps you see why certain agents work on both A and B fires. For Class A fires (ordinary combustibles), you need something that cools and blankets the fuel. For Class B fires (flammable liquids), you need something that disrupts the fuel’s ability to reach the air and keeps the two apart. The foam AFFF extinguisher is specifically designed to tackle both kinds of fuels by forming a film on the liquid surface, cooling the fuel and separating it from the air. This makes it effective on liquid spills as well as on ordinary combustibles.

Water extinguishers are great for Class A but not suitable for Class B. Ordinary dry chemical is typically oriented toward B and C, with less effectiveness on A, while multipurpose dry chemical can handle A, B, and C but doesn’t provide the same liquid-film action as foam. So, for a single agent associated with both A and B, foam AFFF is the most direct fit, with multipurpose dry chemical also capable but not as specifically targeted to liquids as foam.