Here is a simple calculator to obtain the Duct Area of a VAV box when commissioning a new VAV program.
Pick your unit system, select the duct shape, and enter dimensions. Area updates instantly.
This sets the default unit options below.
One unit selector for both width and height.
Duct Area
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Enter dimensions to calculate.
Tip: Most VAV inlet dimensions are entered in inches (Imperial) or mm (Metric).