A HVAC supply vent is a component of a heating, ventilation, and air conditioning (HVAC) system that is responsible for delivering conditioned air to the living space. It is typically located in the ceiling or wall and is connected to the air handler or furnace. The supply vent is designed to direct the air flow in a specific direction, allowing the conditioned air to be evenly distributed throughout the living space. The size and shape of the supply vent will vary depending on the size of the room and the type of HVAC system being used.