What are the main objectives of a smoke control system in buildings?

• A. To suppress all fires automatically.
• B. To contain and control smoke movement, maintain tenable conditions for occupants, protect egress paths, and aid firefighting operations.
• C. To extinguish all flames within seconds.
• D. To vent all air from the building regardless of safety.

Answer: (B)

Smoke control systems focus on managing smoke behavior to keep occupants safe and support firefighting. Their main objectives are to contain and control the movement of smoke, maintain tenable conditions for occupants in means of egress, protect stairwells and exits, and create favorable conditions for firefighters to operate. By directing smoke away from escape routes and preserving visibility and breathable air along paths of travel, occupants can evacuate more quickly and safely. Keeping egress paths clear reduces exposure and confusion during evacuation, while aiding firefighting means providing safer access and reducing heat and smoke near the fire scene.

This isn’t about automatically suppressing fires or extinguishing flames, which are duties of separate fire suppression systems. It also isn’t about venting all air from the building regardless of safety, which would create unsafe conditions.