Which of the following building systems is commonly integrated with fire alarm for occupant safety and control?

• A. Elevators
• B. HVAC
• C. Door unlocking
• D. All of the above

Answer: (D)

Integrating the fire alarm with other building systems is all about keeping occupants safe and giving responders better control during an fire event. Elevators are controlled to recall to a safe floor and are prevented from operating automatically, so people aren’t drawn into a fire area or trapped in a moving car. This keeps evacuation on stairs and other safe paths, and it also frees firefighters to use the elevator shaft if needed.

The HVAC system is coordinated with the fire alarm to limit smoke movement and protect breathable air in escape routes. Shutdown or isolation of air handling reduces smoke spread through ducts, dampers can close to compartmentalize the building, and stairwells can be pressurized to maintain a tenable path for evacuation.

Doors with electronic locks can be released by the fire alarm, allowing people to exit more easily and enabling firefighters to access occupied spaces, while still maintaining security in other parts of the building when appropriate.

Because each of these systems serves a distinct safety function, they are commonly integrated together, making “All of the above” the best answer.