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Variable Air Volume System - A VAV System is a mechanical HVAC system capable of serving multiple zones. It maintains control over the temperature in a zone by controlling the amount of heated or cooled air supplied to the zone.

Ventilation - Process of supplying or removing air by mechanical or natural means to or from some type of enclosed space. The air may be treated or conditioned for comfort.

Verification Phase - Phase to determine ultimate compliance and actual return versus planned or expected return.

Volt - Unit of electromotive force. Amount of force required to drive a steady current of one ampere through a resistance of one ohm. current of one a