Fusible link dampers use a temperature-sensitive mechanism to trigger their closure in the event of a fire. When the temperature in the building rises to a certain level, usually around 74-100 degrees Celsius, the low-melting point in the fusible link melts, causing the link to separate from the pivot. This triggers a spring-loaded mechanism that closes the damper blades and prevents the spread of fire and smoke through the ductwork.
Fusible link dampers provide a simple and reliable means of limiting fire risk. The temperature-sensitive mechanism is a passive system that does not require electricity or other power sources to operate. This means that fusible link dampers can provide a fail-safe means of fire protection, even in the event of a power outage or other emergency.
Fusible link dampers are also easy to maintain. While they may need to be replaced after they have been activated, they are relatively easy to inspect and test on a regular basis. This can help ensure that they are functioning properly and ready to provide the necessary protection in the event of a fire.