A HVAC VAV unit is a type of air handling system that is used to control the temperature and air quality of a building. It is composed of a variety of components, including a fan, a heating and cooling system, a filter, and a damper. The fan is used to move air through the system, while the heating and cooling system is used to maintain the desired temperature. The filter is used to remove dust and other particles from the air, while the damper is used to regulate the amount of air that is allowed to pass through the system. The HVAC VAV unit is designed to provide the most efficient and comfortable environment for occupants, while also reducing energy costs.