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

Class B fires involve flammable liquids, such as gasoline, oil, and grease. The correct answer highlights that foam or dry chemical extinguishers are specifically effective for this type of fire. Foam extinguishers work by creating a barrier between the fuel and the fire, preventing the release of flammable vapors, while dry chemical extinguishers disrupt the chemical reaction occurring in the fire. This makes them suitable for combating Class B fire incidents.

Water extinguishers are not appropriate because they can spread the flammable liquid, worsening the situation. CO2 extinguishers also tackle Class B fires effectively but are only one option rather than a comprehensive answer. Similarly, wet chemical extinguishers are primarily designed for Class K fires, which involve cooking oils and fats, rather than for the general Class B categories. Thus, foam or dry chemical extinguishers are the best choice for Class B fires.