I have modified the OOTB square to round fitting by simply deleting the flange from the round end, as it is not required. Question is, how do I get Revit to automatically use this modified fitting instead of the original one, so that I don't have to manually exchange fittings after they have been automatically drawn.
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The default fittings to be used are defined under Type Properties for each Duct Type. This applies to Pipe, Conduit, and Cable Tray as well.