OCFA Vertical Ventilation Practice Exam

Recognizing pressurized smoke comes from looking at both the smoke’s energy and its appearance. When the fire gases are under pressure, they’re pushed through openings with force, so the smoke tends to be hot, dense, and moving briskly rather than calmly stratified. The best sign of this condition is hot, black smoke that is clearly pressurized—dark, dense plume behaving as if it’s being driven out by the fire below or behind the barrier.

White smoke, especially with little or no pressure and a more laminar, calm flow, suggests unpressurized, cooler gases. Nothing showing means there’s no visible smoke signaling flow at that moment. Seeing smoke with visible flame would confirm active combustion, but the indicator specifically pointing to pressurized smoke is the hot, black, pressurized smoke, since it directly signals a pressure-driven flow that can change how you approach venting and firefighting.