When taking a sounding, if air is rushing in, what does it indicate?

• A. Fire
• B. Flooding
• C. Ventilation
• D. Leak

Answer: (A)

If air is rushing into the space during a sounding, it means there is a strong draft drawing air from outside into the compartment. That draft is most consistent with a fire in that space, because combustion consumes oxygen and creates a pressure/flow that pulls air in to feed the flame. The presence of a fire will produce noticeable air movement as hot gases rise and fresh air is drawn in through any openings. So this sign points to an active fire in the space being sounded, rather than a flood, normal ventilation, or a simple leak.