The definition of a damper HVAC is a device that is used to control the flow of air within a heating, ventilation, and air conditioning (HVAC) system. It is typically installed in the ductwork of an HVAC system and is designed to open and close to regulate the amount of air that is allowed to flow through the system. This helps to maintain a comfortable temperature in the home or office and also helps to reduce energy costs. The damper is usually operated by a motor or a manual lever, and can be adjusted to the desired level of airflow. In some cases, dampers can also be used to shut off airflow to certain areas of the home or office, such as the attic or basement. Dampers are an important part of any HVAC system, as they help to ensure that the system is running efficiently and that the desired temperature is being maintained.