<p>Vav terminal unit details including 3 way modulating valve air vent valve w / plug vav terminal unit , h. w reheat coil , union , ball valve , temperature and press test plug HWR piping , calibrated piping valve , balancing plug valve , air inlet <strong> </strong><em>VAV</em> systems supply air at a variable temperature and airflow rate from an air handling <em>unit</em> (AHU). A VAV terminal unit, often called a VAV box, is the zone-level flow control device. It is basically a calibrated air damper with an automatic actuator. The VAV terminal unit is connected to either a local or a central control system. also a device that is used to regulate the volume of conditioned primary air from the central air handler to the occupied space. for more details of Vav terminal unit details download this file. </p>