To export ductwork to an IFC file, use the “DM HVAC->Sections and 3D Drafting->Export Ductwork to IFC File” command.

Select the ducts to export and enter a name for the file.

If you have ductwork in multiple areas or on multiple drawings, you will need to export multiple IFC files.

These IFC files can be imported into Revit and used for collision detection with the architectural model.