A duct run is a collector of features and parts, and is typically a child of a duct system. It also provides the Catalog specification from which you can choose the parts. Duct run is a duct path with the same specification, material, and values of maximum recommended velocity and pressure loss.
Detect and repair any discontinuities in the duct run using the RouteDevCustomCmd,Ingr.SP3D.Route.Client.CustomCommand.ReportDiscontinousRun Custom Command.