What Is the Function of a Fusible Link in a Fire Damper?

1. Initiating the Fire Damper Mechanism

The main function of a fusible link in a fire damper is to automatically initiate the closing of the damper when the temperature increases to a hazardous point. The fusible link is constructed of a metal alloy that melts at a particular temperature, most often 165°F (74°C), though greater temperature ratings can be found for application in special situations. When the link melts, it frees the damper’s blades so that they can close off and seal the way from fire and smoke.



2. Passive Fire Protection Assurance

In contrast to active fire suppression systems like sprinklers, fire dampers do not need electricity or external action. The fusible link guarantees the fire damper will automatically function even in the event of power loss during a fire emergency.

3. System Integrity Retained Until Activation

A fusible link keeps the fire damper in an open state under normal conditions. This permits air to flow freely through the HVAC system. The link is strong enough to endure normal temperature variations but will only fail when subjected to extreme heat, keeping the fire damper functional until required.

4. Regulatory Compliance and Safety Standards

Fusible link fire dampers are required to comply with NFPA 80 and NFPA 105 regulations, which dictate their installation, testing, and maintenance. The regulations guarantee that the fusible link operates as intended and that the fire damper is trustworthy during an emergency.

5. Fusible Link Inspection and Replacement

Routine inspection and servicing of fusible links are required to maintain fire dampers in working condition. With time, dust, corrosion, or mechanical interference can impair the link’s performance. Fire safety codes generally mandate that fire dampers be inspected every 4–6 years, based on building type and use. In case a fusible link is damaged or worn, it should be replaced immediately to maintain proper fire damper operation.


 

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