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The Wine – MEP API
Ducts and Pipes
Autodesk.Revit.MEP.Duct
Autodesk.Revit.MEP.FlexDuct
Autodesk.Revit.MEP.Pipe
Autodesk.Revit.MEP.FlexPipe
§Read access to duct properties, types, and geometry
§Change duct/pipe type
§Move duct/pipe
§Layout a duct/pipe
ØGiven two points, or given one point and connector, or given two connectors
4 classes to represent each type mentioned. They collectively derive from MEP curve type which has the properties that these objects need.

For moving an object, it is recommended to use the API move command rather than using the location, since the system will stay updated with the change. Location change will not merely change\update the system.