Learn how Variable Air Volume (VAV) HVAC systems work, how to design VAV boxes and ductwork, and when VAV is the right choice over constant volume or fan coil systems.
A Variable Air Volume (VAV) HVAC system modulates the volume of conditioned air delivered to each zone in response to the zone's load. Unlike a Constant Air Volume (CAV) system — which always delivers the same airflow and varies temperature — a VAV system varies airflow while maintaining a relatively constant supply air temperature (typically 55°F for cooling).
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