What is the main goal in setting a fire boundary?

• A. Stop the spread to contain the fire
• B. Extinguish all flames immediately
• C. Ventilate the space
• D. Preserve structural integrity

Answer: (A)

The main idea behind setting a fire boundary is containment—isolate the fire so it can’t spread to neighboring compartments. By closing fire doors, sealing openings, and closing dampers, you create a protected zone where heat, smoke, and flames stay put long enough for suppression efforts to work and for occupants to move to safety. This approach buys time, preserves critical spaces and systems, and reduces overall damage by preventing the fire from jumping into new areas. While efforts to extinguish the flames are important, the boundary’s primary purpose is to stop spread first; ventilating a space can worsen the fire if it’s not done with a controlled plan, and preserving structural integrity is a vital benefit that comes from keeping the fire contained but isn’t the initial objective.