Variable Air Volume Systems provide constant temperature air while the volume of air varies. This gives a greatly reduced cost compared to conventional HVAC systems as they use less fan energy and refrigeration energy.
Variable Air Volume Systems also cut initial costs as system capacity is determined from the peak demands of specific zones in lieu of peak demands for the entire building.
Hospital rooms and clean rooms frequently require constant and high ventilation rates which tend to favour dual duct terminal units.
With today's energy conservation needs, air terminals are designed for and adaptable to any modern VAV requirements.
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