CFEMS engines typically carry both Class A and Class B foam to enhance their firefighting capabilities. Class A foam is designed to fight fires involving ordinary combustibles such as wood, paper, and some plastics. It is particularly effective in creating a blanket over these materials to cool them and prevent rekindling. On the other hand, Class B foam is particularly useful for fighting flammable liquid fires, such as those involving gasoline, oil, and other hydrocarbons. Class B foam suppresses the vapors and forms a barrier that helps separate the fuel from the air, effectively extinguishing the fire.
By carrying both types of foam, CFEMS engines are equipped to handle a wider variety of fire scenarios, ensuring a more versatile approach to firefighting. This dual-foam capability allows firefighters to effectively respond to different kinds of emergencies and enhances their effectiveness on the scene.