What is the minimum temperature required to activate a fire damper in a standard duct system?

In a standard duct system, the minimum temperature required to activate a fire damper is typically 165°F. Fire dampers are crucial safety components designed to prevent the spread of fire and smoke through ductwork. Upon reaching the designated temperature, the fusible link within the damper melts, allowing the damper blades to close and block airflow.

The selection of 160°F as the minimum activation temperature is very close and is commonly accepted in many applications, but it is important to recognize that codes and standards such as those from the National Fire Protection Association (NFPA) generally specify values around that range. Understanding that fire dampers are designed with specific activation temperatures helps professionals in the HVAC industry ensure they are installing and maintaining systems that comply with safety codes and effectively protect building occupants.