What type of agent should be used on Class B fires?

When addressing Class B fires, which involve flammable liquids such as gasoline, oil, and solvents, the most effective agents for extinguishing them are foam, carbon dioxide, and foam, depending on the specific situation.

Foam is particularly effective because it can smother the fire and prevent oxygen from reaching the flammable liquids, thus extinguishing the flames. It also helps mitigate the risk of re-ignition by forming a blanket over the liquid.

Carbon dioxide is another suitable choice for Class B fires. It works by displacing oxygen and can be very effective in confined spaces where flammable liquids are involved. It does not leave a residue, making it ideal for protecting sensitive equipment.

While water may not be the preferred choice for Class B fires due to the risk of spreading the fire (as it can cause flammable liquids to float and spread), it can be effective under certain conditions, such as when high-pressure streams are utilized to cool the environment and reduce heat.

Utilizing all three agents provides flexibility and effectiveness against Class B fires, making it vital for firefighters to be trained in the appropriate circumstances for using each type of extinguishing agent.