What is Damper?
A damper is a valve or plate that prevents or controls air flow within a duct, chimney, variable air volume box, air handler, or other air handling machinery. A damper can be used to cut off or control central air conditioning in an unused space.
Manual & Automatic Damper:
It can operate manually or automatically. A handle on the outside of a duct turns manual dampers. Automatic dampers are used to continually control airflow and are operated by electrical or pneumatic engines, which are governed by a thermostat or construction automation scheme.
Automatic or motorized dampers can also be regulated by a solenoid and the degree of air-flow calibrated to modulate the air-conditioned air flow to regulate the environment.
A zone damper is a specific type of damper used to control the flow of air in a heating, ventilation, air conditioning (HVAC) system.
Zone dampers are generally driven electrically as used in home HVAC systems. Vacuum or compressed air can be used instead
There are two major designs. The engine is often a tiny, shaded-pole synchronous engine in one model coupled with a rotary switch that can disconnect the engine at either of the two stop points.
Another style of electrically powered damper uses a spring-return mechanism and a shaded-pole synchronous motor. The damper is usually opened by the spring force in this door, but can be closed by the engine force