Exit doors that are normally kept open may be equipped with fusible-link devices to close them when a fire occurs. What is the primary purpose of this feature?

• A. To prevent the door from closing inadvertently
• B. To close to prevent smoke spread
• C. To allow ventilation during a fire
• D. To improve energy efficiency

Answer: (B)

When exit doors are normally held open, a fusible-link device is used to ensure the door can close automatically in a fire. The fuse melts at a set temperature, releasing the door closer so the door shuts. The main purpose is to create a barrier that stops smoke from spreading from one area to another, helping protect occupants and keep escape routes tenable and accessible for firefighters. It isn’t about preventing closing, enabling ventilation during a fire, or improving energy efficiency.