How far above the normal temperature must a fire damper actuating device operate?

The correct answer indicates that a fire damper actuating device must operate at least 50 degrees above the normal temperature to function properly. This temperature threshold is crucial because it ensures that the damper will activate in the event of a fire, preventing the spread of smoke and heat through the HVAC system.

Fire dampers are safety devices designed to automatically close off air passages when they detect elevated temperatures, which typically indicate the presence of fire. The 50-degree margin above normal ambient temperatures provides a sufficient buffer to account for sensor accuracy, ensuring that the dampers respond reliably in emergency situations.

A setting this high can help mitigate false activations, reducing the chances of unnecessary interruptions in airflow or damage to the damper system itself due to minor fluctuations in temperature. Therefore, a 50-degree activation point supports both safety and system integrity within HVAC operations.