What type of extinguisher is recommended for a Class B fire?

For a Class B fire, which involves flammable liquids such as gasoline, oil, and grease, the most effective type of extinguisher is one that can smother the flames and prevent the fire from spreading. The HALON extinguisher is effective for this type of fire because it works by interrupting the chemical reaction that fuels the fire, and it is especially beneficial in situations where electrical equipment is present, as it does not conduct electricity and leaves no residue.

The other options are less suitable. A CO2 extinguisher, while effective for Class B fires as well, is typically more suited for electrical fires and is less effective on larger flammable liquid fires due to its limited range and lack of cooling properties. Water extinguishers should never be used on Class B fires, as water can spread the flammable liquids and exacerbate the fire. Dry powder extinguishers can be used on Class B fires, but HALON is preferred in situations where clean-up is a concern or where equipment damage must be minimized. Thus, the HALON extinguisher is a strong choice for dealing with Class B fires, especially in sensitive environments.