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Select a run, and then click Properties .
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On the Properties dialog, click the General Tab (Duct Run Properties Dialog).
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Review the properties that have been assigned to the duct run, including Name, Specification, Material, and Thickness.
You can edit the flow direction of the duct run on the Properties dialog, or by clicking the flow direction indicator on the duct run and then selecting the new direction. See Change the flow direction of a duct run.
You can also edit the cross-section properties on the Edit Duct Run Ribbon. See Route Duct Command.