North Carolina Fire Operations 9 Practice Test

Attic fires are driven by a large amount of fuel stored in the attic and the open vertical space above the living areas. The attic acts like a chimney: hot gases rise through the open voids, convection currents pull in air from below, and radiant heat from the flames and heated structural members preheats surrounding materials. This combination—lots of wood and other attic fuels, open channels for air and heat to move upward, and radiant heat aiding ignition—causes the fire to spread rapidly and involve the attic structure quickly. In contrast, basement SAMPLEfires occur in a more enclosed lower space with different air flow, large building fires involve many rooms and floors with varied ventilation, and trash fires typically have smaller fuel loads and less open vertical space for convection and radiant heat to drive rapid growth.