Which types of extinguishers are classified as Class B hazard extinguishers?

Class B fire extinguishers are specifically designed for fires involving flammable liquids, such as gasoline, oil, and solvents. The correct answer highlights various types of extinguishing agents that are effective against these kinds of fires.

AFFF (Aqueous Film Forming Foam) and FFFP (Film Forming Fluoroprotein Foam) are effective because they create a barrier that suffocates the fire and prevents re-ignition by cutting off the oxygen supply. CO2 extinguishers work by displacing oxygen and cooling the fuel, making them suitable for Class B hazards. Dry chemical extinguishers, particularly those containing agents like monoammonium phosphate, are effective against Class B fires as they can interrupt the chemical reaction of the fire. Halogenated agents are also designed to combat Class B fires by displacing oxygen and interrupting the combustion process.

The other choices include types of extinguishers that are not ideally suited for Class B fires. For instance, water types are generally not effective against flammable liquids as they can spread the fire. Wet chemical extinguishers, while excellent for certain types of fires, are typically categorized for Class K (cooking oils and fats), and therefore cannot be included in a list specifically