What type of fire extinguisher is used for Class B fires involving flammable liquids?

• A. Water extinguisher
• B. Chemical foam extinguisher
• C. Carbon dioxide extinguisher
• D. Halon extinguisher

Answer: (D)

Class B fires involve flammable liquids, such as gasoline, oil, and other petroleum-based products. The correct choice for extinguishing such fires is the Halon extinguisher. Halon works by interrupting the chemical reaction of the fire, effectively smothering it and preventing re-ignition. It is particularly effective for flammable liquids, as it does not leave a residue and is suitable for areas where sensitive equipment might be present, such as server rooms or aircraft.

Other extinguishing agents, like water, can exacerbate a Class B fire by spreading the flammable liquid rather than extinguishing it. Chemical foam extinguishers can also be effective against Class B fires because they create a barrier between the fuel and the fire. However, Halon extinguishers are preferred in many scenarios due to their effectiveness and the fact that they don't conduct electricity, making them safer for use in environments with electrical equipment. Carbon dioxide extinguishers can also be used for Class B fires; however, Halon remains the most specialized option in certain applications.