A HVAC duct damper is an important component of any heating, ventilation, and air conditioning (HVAC) system. It is a mechanical device that is used to regulate the flow of air through a duct. The damper is typically installed in the ductwork and is used to control the amount of air that is allowed to pass through the duct. It can be used to reduce the amount of air that is being circulated in a space, or to increase the amount of air that is being circulated. The damper can also be used to balance the air pressure in a space, or to control the temperature of the air that is being circulated. In addition, the damper can be used to control the humidity levels in a space. By controlling the amount of air that is allowed to pass through the duct, the HVAC duct damper helps to maintain the comfort level of the space.