Which class extinguisher is used for flammable liquids and gases?

Which class extinguisher is used for flammable liquids and gases?

• A. Class D
• B. Class B
• C. Class C
• D. Class A

Answer: (B)

Fires are categorized by what is burning, and the extinguisher chosen must match that fuel type. For flammable liquids and gases, the appropriate option is a Class B extinguisher. The agents used for Class B are designed to blanket the fuel surface or vapor, smother the flame, and prevent contact with oxygen, rather than cooling the fuel with water. This also helps prevent spreading the liquid or reignition. Common Class B extinguishing agents include dry chemical, foam, and certain CO2 formulations. Using water on flammable liquids can spread the fire and on gases can be dangerous, so the correct class focuses on interrupting the flame at the fuel level rather than cooling. Therefore, Class B is the right choice for fires involving flammable liquids and gases.

Fires are categorized by what is burning, and the extinguisher chosen must match that fuel type. For flammable liquids and gases, the appropriate option is a Class B extinguisher. The agents used for Class B are designed to blanket the fuel surface or vapor, smother the flame, and prevent contact with oxygen, rather than cooling the fuel with water. This also helps prevent spreading the liquid or reignition. Common Class B extinguishing agents include dry chemical, foam, and certain CO2 formulations. Using water on flammable liquids can spread the fire and on gases can be dangerous, so the correct class focuses on interrupting the flame at the fuel level rather than cooling. Therefore, Class B is the right choice for fires involving flammable liquids and gases.