What function does a fusible link serve in a fire damper?

A fusible link in a fire damper plays a crucial role in fire safety by melting at a specific, predetermined temperature. When the link melts, it triggers the closing mechanism of the damper, which is essential for preventing the spread of smoke and flames through ductwork in case of a fire. This automatic response helps to compartmentalize a building, confining the fire to a smaller area and providing more time for evacuation and fire response.

The effectiveness of a fusible link is vital because it operates without the need for external intervention. By automatically closing the damper when exposed to high temperatures, the fusible link acts as a critical safety feature that enhances the fire protection strategy of HVAC systems. This function is integral to maintaining the safety of building occupants and the structure itself in emergency situations.