Within each exhaust, how many fusible links or heat detectors are required?

Within each exhaust, how many fusible links or heat detectors are required?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (A)

In this exhaust protection approach, only one fusible link or heat detector is needed per exhaust to trigger the automatic action (like closing a damper or activating the suppression) if a fire is detected. The exhaust path is treated as a single zone, so a single sensing point is sufficient to sense heat and initiate protection for that duct run. Additional devices wouldn’t meaningfully speed up response or improve protection and would simply add cost and potential for coordination issues. A single properly placed fusible link or heat detector provides reliable activation while keeping the system simple and dependable.

In this exhaust protection approach, only one fusible link or heat detector is needed per exhaust to trigger the automatic action (like closing a damper or activating the suppression) if a fire is detected. The exhaust path is treated as a single zone, so a single sensing point is sufficient to sense heat and initiate protection for that duct run. Additional devices wouldn’t meaningfully speed up response or improve protection and would simply add cost and potential for coordination issues. A single properly placed fusible link or heat detector provides reliable activation while keeping the system simple and dependable.