A VAV system supplies air that is characterized by?

In a Variable Air Volume (VAV) system, air supply is characterized by providing constant temperature air while adjusting the volume of air delivered to different zones based on demand. This means that the temperature of the air remains stable to ensure comfort and efficiency, but the system can increase or decrease the amount of air delivered to various areas of a building, depending on the specific heating or cooling requirements of those zones.

This ability to control the air volume allows for precise temperature control and energy efficiency, as it can respond to changes in occupancy or environmental conditions within those zones. Thus, having constant temperature but varying volumes is a fundamental aspect of how VAV systems operate in HVAC applications, making this answer the most accurate reflection of VAV system characteristics.