A
damper is a valve or plate that stops or regulates the
flow of air inside a
duct,
chimney,
VAV box,
air handler, or other air handling equipment. A damper may be used to cut off central
air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room
temperature and
climate control. Its operation can be manual or automatic. Manual dampers are turned by a handle on the outside of a duct. Automatic dampers are used to regulate airflow constantly and are operated by
electric or
pneumatic motors, in turn controlled by a
thermostat or
building automation system. Automatic or motorized dampers may also be controlled by a
solenoid, and the degree of air-flow calibrated, perhaps according to signals from the thermostat going to the actuator of the damper in order to modulate the flow of air-conditioned air in order to effect climate control.