Definitions for "Variable Air Volume"
An air handling system, unlike a single zone, terminal reheat, multi-zone, or dual duct, supplies air at a constant temperature and varies the air quantity supplied to each zone.
An HVAC design that heats or cools a conditioned space by increasing or decreasing the amount of air entering a conditioned space.
Variable Air Volume or VAV systems control the air volume. The simplest control is a simple On-Off control of fans but the complex damper controls are more common as variable speed control of fans is the most economic method to control the air volume.