Duct Pro for Autodesk Inventor Duct Pro is a simple and affordable sheet metal duct design add-on for Inventor. It runs side by side with Autodesk Inventor and automates the creation of standard sheet metal duct components. It increases productivity by saving the designer time by automating the creation of sheet metal duct components and geometry by utilising its intuitive graphical user interface. Increased Productivity Standard sheet metal duct components like Lobsterbacks, Y- Transitions, Square to Round, Cones, T-Connectors, Elbows etc. can be inserted into your Inventor assembly on the fly.