A damper is a device that deadens, restrains, or depresses Dampers Technology Ltd offer a wide range of damper products to suit many applications A damper – mechanical, acoustical, or aerodynamic oscillations Automatic dampers are used to regulate airflow constantly and are operated by electric or pneumatic Actuators .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 Dampers will regulate it for room-by-room temperature and climate control.