In general a fire damper works when heat from a fire causes the normal temperature of a room to rise to approximately 165 degrees Fahrenheit i.e. it is designed to close automatically on the detection of heat. ... The fusible link which is attached to the damper melts causing the dampers' door to close.

How do smoke dampers work?

Fire dampers respond to heat, when the temperature reaches a set point the damper slams shut. Smoke dampers respond to the detection of smoke, and close automatically. They can also be activated remotely. They resist the passage of smoke, toxic gases and air through a fire barrier.

Where do fire dampers go?

Location: Fire dampers are installed in or near the wall or floor, at the point of duct penetration, to retain the integrity and fire rating of a wall or floor whether it is a ducted or open-ple- num return application.