The best results from MAP’s CAD-Duct to Tekla BIMsight, Tekla Structures or most any BIM software is IFC. To export an IFC from CAD-Duct you need to do is search for ‘ifcexport’ in available commands list. Pick the ifcexport command, select the objects you want to export and use the IFC XML ZIP format. One advantage of using IFC from CAD-Duct is that a lot of attributes get exported as well which will then be available in Tekla BIMsight