How do fire alarm systems interface with smoke control systems and elevator recall sequences?

• A. Elevators recall automatically operate independently of fire alarms.
• B. Smoke control systems operate without any input from the fire alarm.
• C. Elevator recall is triggered only by manual calls from the building manager.
• D. Fire alarm signals can initiate elevator recall to designated floors, trigger smoke control actions, and coordinate with ventilation for tenable egress.

Answer: (B)

When a fire alarm activates, it serves as the central trigger that coordinates several life-safety systems to keep occupants safe during evacuation. The elevators are brought into a controlled recall to a designated floor or safe location so they don’t operate normally during a fire, preventing people from getting trapped in a burning area. At the same time, the smoke control system responds to the alarm signals by managing dampers, fans, and airflow in the building—often adjusting stairwell pressurization and smoke exhaust to keep escape routes tenable. The ventilation system works in tandem with these actions to ensure that airflow supports safe egress and doesn’t spread smoke into occupied spaces.

So the best description is that fire alarm signals can initiate elevator recall to designated floors, trigger smoke control actions, and coordinate with ventilation to maintain tenable egress. The other statements are incomplete or inaccurate because elevator recall isn’t independent of the fire alarm, smoke control generally requires input from the fire alarm, and recall isn’t limited to manual triggers.