Does the duct have a catalogue associated with it? Is it spiral/oval? For our spiral/oval pipe we have to create a new itm per material because the spec wont drive the correct material unless the itm default is set from the start.
Nathan Chapman
Production Manager at General Heating and Air Conditioning
Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author
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