Fire dampers are typically activated by which component?

Fire dampers are designed to automatically close in the event of a fire to prevent the spread of smoke and flames through ductwork in a building. The component that typically activates fire dampers is the fusible link. A fusible link is a temperature-sensitive device that melts when exposed to high temperatures, such as those generated by a fire. When the link melts, the damper's blade is released and closes, thereby sealing off the duct.

This mechanism is critical because it provides a passive fire protection solution that operates automatically without the need for electrical power or manual intervention, ensuring that smoke and heat do not travel through ventilation systems, which could exacerbate a fire situation.

The other components mentioned do not serve this function for fire dampers. Electrical signals are used in various fire alarm and suppression systems, while mechanical switches and thermostatic valves are not designed specifically for the activation of fire dampers. Therefore, the reliance on fusible links is a key aspect of how fire dampers operate effectively in fire protection systems.