The 2000 series is a low leakage damper consisting of various types:
Quick and easy maintenance and control. Units include a control box that connects the actuator to an electrical thermal fuse where the power is cut to the actuator when 74 degrees Celsius is reached.
These units are effectively a fire dampner with a hand control to reset. The damper is held in the open position by a locking mechanism that incorporates a fusible link set to 74 degrees Celsius. When the fusible links breaks, the dampner closes.
Relies on the actuator to open and close the dampner. Designed with a mechanical override so that when duct temperature reaches 74 degrees Celsius a fusible link breaks the connection (actuator and dampner) and the blades slam shut via a built-in spring.
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