Which energy classification uses compressed air prior to discharge?

• A. Low energy foam system
• B. High energy foam system
• C. Direct injection system
• D. Ablative system

Answer: (B)

High energy foam systems use compressed air before the foam exits the nozzle. That air is introduced to the foam solution just prior to discharge, creating a much higher expansion ratio and a thick, stable foam blanket quickly. This rapid, airy foam helps cool and separate the fuel from the fire, which is especially effective on hydrocarbon fires.

Low energy foam relies on minimal air and gentler mixing, giving slower, less expansive foam. Direct injection puts foam concentrate into the water stream without significant air mixing, resulting in lower foam expansion. Ablative systems operate on a different principle focused on heat absorption via an ablative layer rather than foam generation with compressed air.