, also known as a VCD, is a device used in heating, ventilation, and air conditioning (HVAC) systems to regulate the airflow within ductwork. It is designed to control the volume or rate of air entering or leaving a specific area or room.

Construction: Blades: The damper consists of multiple blades that can be adjusted to control the airflow. These blades can be fixed or movable, depending on the specific design and application.