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Select the duct features to change by holding down the SHIFT key while selecting all the duct features along the run.
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Click Properties on the horizontal ribbon.
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On the Duct Feature Properties dialog box, click the Cross Section Tab.
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Change the dimensions for the selected features as needed. Be aware that the software does not automatically recalculate dimensions of existing duct.
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If needed, switch the local axis of the duct associated with the width axis of the offset cross section by changing the orientation angle. By default the width is associated with the U-axis.
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Type the number of degrees to change the angle of the selected cross section in the Orientation Angle box.