How Do VAV Boxes Work?
What is a VAV Box? A Variable Air Volume (VAV) box, is a part of an air conditioning system. It is located inside the duct work. It is designed to control the air flow to a specific area, called a “zone.” The VAV regulates the volume of the air to the zone by opening or closing the damper, thus controlling the amount of conditioned air directed to the zone. Each zone in a building has a thermostat which controls the VAV, telling it when to open or shut the damper based upon the needs of the zone. VAV Box Parts The traditional VAV box contains several parts which are necessary for operation. The casing is the outer box or shell, usually made from 22 gauge galvanized steel. The inlet is the connection to the duct coming from the Air Handling Unit. The outlet is the connection to the duct leading to the zone. Inside is the damper, or the metal door which opens or closes to control the amount of air flow needed. The damper controlled automatically by a motor, which is controlled by the the
