Hello @Anonymous,
I understand that you mostly use AutoCAD to create 2D drawings for production.
You want to move to 3D without losing the 2D drawings.
My advice is moving to Inventor. There you can create 3D product models using parts, generate bill of materials, create sheet metal, etc.
When you want to place those 3D models in a Building model where they use Revit, you can export the model to a ADSK file format that easily can be imported into Revit.
See this movie: https://www.youtube.com/watch?v=R7_agbZM3Dw
You could import your blower models (ADSK files) into Revit and model the Duct work in the Building environment if a 3D BIM model is available.
If you create also ductwork and want to create NC files to produce the Ducts and Duct Fittings you could have a look at Autodesk Fabrication MEP.
There is also a good workflow from Revit to Fabrication MEP and back.
See this site: https://www.autodesk.com/products/fabrication-products/case-studies
You also can export your Inventor model to an IFC format so other BIM software can use your model.
See this movie: https://www.youtube.com/watch?v=UX6pkaI3A6c
With Inventor, you can create sheet metal drawings.
See this movie: https://www.youtube.com/watch?v=YBQkw2j3ei8
Investigate what your customers want and make a plan for moving to a 3D workflow.
Hope this helped a bit.
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Kind regards,
Robert Klempau
Senior Consultant AEC
Cadac Group AEC BV