Revit MEP Modeling, since inception, has been delivering an array of options to design ductwork models, however; there are several challenges that sheet metal fabricators face when modelling ductwork in Revit. Ductwork, unique in design for each of the structures and elements expose several challenges while designing.
Revit MEP by Autodesk is an established tool for ductwork modeling that addresses the core elements of a ductwork system, allowing a reasonably sound set of design drawings to be issued. Challenges for fabrication from Revit was a big area of concern, till the time Autodesk started addressing them; and now we see successful fabrication interoperability.