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

The recommended type of fire extinguisher for use on a Class B fire is dry chemical. Class B fires involve flammable liquids such as gasoline, oil, grease, and other similar substances. Dry chemical extinguishers contain agents such as sodium bicarbonate, potassium bicarbonate, or monoammonium phosphate, which are effective at interrupting the chemical reaction of the fire and can smother the flames.

Using a dry chemical extinguisher for a Class B fire is advantageous because it can rapidly suppress the flames and prevent the fire from spreading. It is particularly effective for this type of fire because it can quickly extinguish fires fueled by volatile liquids, which burn differently compared to structural fires or those fueled by solid materials.

While foam extinguishers are also effective on Class B fires by creating a barrier between the fuel and the flames, dry chemical extinguishers are often more readily available and provide quick control of the fire. The other options, like water, are ineffective and potentially dangerous when used on flammable liquid fires as they may spread the fire instead of controlling it. CO2 extinguishers can be used on Class B fires, but they may not be as effective in certain circumstances, particularly where there is a risk of rekindling