This class is designed to promote understanding of Variable Air Volume and the concept of air movement. It discusses the different concepts in equipment and design. Program introduces the systems, valves, and zone controls. Early pneumatic styles up to the early electronic boards are covered. VariTrac™ covers the newer style of VAV Systems along with the electronic controls. VariTrac™ is used to turn small constant volume commercial systems into VAV. VariTrane™ and VariTrac™ boxes are used in both configurations.