A damper for HVAC is a device that is used to control the flow of air in a heating, ventilation, and air conditioning (HVAC) system. It is typically used to regulate the temperature in a room or area by controlling the amount of air that is allowed to flow through the system. Dampers are usually installed in ducts or vents and can be manually or automatically adjusted to meet the desired temperature. They can also be used to prevent the spread of smoke, fumes, and other hazardous materials. Dampers are an important part of an HVAC system and are essential for maintaining a comfortable environment. They are also a great way to save energy by allowing only the necessary amount of air to flow through the system.