Florida Fire State Practice Exam

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Class B foam is used to extinguish flames as well as to do what else?

Suppress vapors
Enhance fires
Cool down surfaces
Speed up combustion

The correct answer is: Suppress vapors

Class B foam is primarily designed to extinguish flammable liquid fires, such as those involving fuels, oils, and solvents. In addition to its extinguishing properties, Class B foam serves an important secondary function: it helps suppress vapors. This is crucial in preventing the re-ignition of flames that can occur when flammable vapors linger in the air after a fire has been extinguished. By creating a barrier over the surface of the burning liquid, the foam not only suffocates the flames but also limits the release of flammable vapors into the atmosphere, providing a more comprehensive approach to fire suppression. The other options do not accurately represent the role of Class B foam. Enhancing fires and speeding up combustion contradict the very purpose of fire suppression. Cooling down surfaces, while a useful action in firefighting, is not the primary function of Class B foam compared to vapor suppression.