The operating temperature of a fire damper actuating device is typically how much above the normal temperature in the duct system?

The operating temperature of a fire damper actuating device is typically set to activate at a specific temperature above the normal operating conditions within the duct system. This is essential for maintaining safety during a fire, as it ensures that the damper closes before any smoke or flames can travel through the ductwork.

A common standard for the activation temperature is 50°F above the normal temperature of the system. This threshold allows for timely detection of elevated temperatures that may indicate a fire in the ductwork while also taking into account the operational parameters of the HVAC system. By setting this activation point, the fire damper can effectively perform its function of curtailing smoke and heat spread, thus enhancing the overall safety of the building occupants.

The other temperature options, while they may seem plausible, do not align with the commonly accepted standards for fire damper operation. For instance, thresholds like 25°F, 75°F, or 100°F may either be too low to react promptly to a fire or too high, risking the integrity of the system and safety of the building. Thus, the selection of 50°F as the activation point strikes a balance between operational efficiency and fire safety.