Class A fires? Type of extinguishing agent?

Class A fires? Type of extinguishing agent?

• A. Water, foam, clean agent, ABC dry chem
• B. Wood, cloth, paper, rubber, plastics
• C. Cooking oils, grease, animal fats
• D. Electrical equipment

Answer: (B)

Class A fires involve ordinary combustibles—materials that burn and leave ash. Wood, cloth, paper, rubber, and many plastics fall into this category, so listing those materials correctly identifies what makes up Class A. The other options describe either extinguishing agents or different fire classes (cooking oils and animal fats map to Class K, electrical equipment to Class C/E). While water-based extinguishing agents are effective for Class A because they cool the fuel, the key idea here is which fuels define Class A, not which extinguishing agent is used.

Class A fires involve ordinary combustibles—materials that burn and leave ash. Wood, cloth, paper, rubber, and many plastics fall into this category, so listing those materials correctly identifies what makes up Class A. The other options describe either extinguishing agents or different fire classes (cooking oils and animal fats map to Class K, electrical equipment to Class C/E). While water-based extinguishing agents are effective for Class A because they cool the fuel, the key idea here is which fuels define Class A, not which extinguishing agent is used.