If the vertical ventilation plan cannot be safely executed due to structural instability, what is the appropriate action?

• A. Abandon the incident
• B. Ventilate only from the lowest point
• C. Defer ventilation and reassess risk, coordinate with command, and consider alternate tactics
• D. Proceed with ventilation regardless

Answer: (C)

When the vertical ventilation plan cannot be safely executed because the structure is unstable, the priority is to pause and reassess with command before proceeding. Deferring ventilation and reassessing risk, coordinating with command, and considering alternate tactics is the best path because it keeps crews out of danger while the situation is evaluated and a safer plan is developed. This approach acknowledges the risk of collapse, backdraft, or other sudden changes in conditions and ensures a coordinated, safer shift in tactics.

Moving forward with ventilation regardless would ignore the immediate danger and could trap or injure firefighters. Ventilating from the lowest point alone doesn’t address the unstable conditions and could still expose crews to collapse or rapidly changing smoke and heat. Abandoning the incident entirely isn’t the appropriate default; there are safer, coordinated ways to continue firefighting with an exterior or alternate approach while conditions are reassessed.