An untrained operator using an extinguisher rated 10B can extinguish approximately how large a flammable liquids fire area?

An untrained operator using an extinguisher rated 10B can extinguish approximately how large a flammable liquids fire area?

• A. 5 ft2
• B. 10 ft2
• C. 20 ft2
• D. 50 ft2

Answer: (B)

The key idea is how Class B extinguisher ratings are defined. For flammable liquids, the rating on the extinguisher represents the approximate fire area the extinguisher is designed to control under test conditions. A higher number means the extinguisher is expected to handle a larger area. So, a rating of this size is intended for a small flammable-liquid fire area. In real life, an untrained operator may not achieve the full rating, but you use this figure as a guideline. If the fire covers a larger area than what the rating covers, more extinguishers or immediate professional help would be necessary.

The key idea is how Class B extinguisher ratings are defined. For flammable liquids, the rating on the extinguisher represents the approximate fire area the extinguisher is designed to control under test conditions. A higher number means the extinguisher is expected to handle a larger area. So, a rating of this size is intended for a small flammable-liquid fire area. In real life, an untrained operator may not achieve the full rating, but you use this figure as a guideline. If the fire covers a larger area than what the rating covers, more extinguishers or immediate professional help would be necessary.