Variable Air Volume Terminals units are designed to use in low to high pressure single duct variable air volume systems to regulate the flow of air to a room or group of rooms to maintain comfortable temperature level.
Dampers modulate the flow of air through the ducts to the various parts of the building, reducing or increasing the airflow depending upon conditions. Dampers also regulate the quantity of outside air that is allowed to enter the air-handling unit and mix with return air for ventilation purposes.
Dampers can be difficult to maintain and can affect occupant comfort as the space requirements change and as the air-handling system ages. A typical commercial HVAC system has numerous dampers that alter the flow of outside air, return air, exhaust air, and supply air.
An efficient air-handling system minimizes the number of dampers necessary overall and eliminates dampers or uses low-loss dampers at branch takeoffs, reducing the fan power needed to blow air past them but maintaining the capability for minor balancing adjustments. Using variable-speed drives for fan regulation can eliminate the need for fan inlet or discharge dampers.
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