Here Air volume arrangement process the variable air volume is the core process that entails effective functioning, the whole system helps get maximum benefit. An overview of this variable air volume entails that it is equipped with a supply duct that cools down the environment by providing supply air at any desired temperature.The conditioned air is then distributed to the zones via single ducts. A variable air volume (VAV) can vary the air flow at a constant temperature. In a VAV system one supply duct distributes supply air at a constant temperature. It is an equipment which is used to examine the total volume of air inhaled and exhaled by the lungs. It is also used in testing the pulmonary function. for more details of Air volume arrangement process download this file .