Hello!!

I just started using CADmep and will need to convert the ductwork from a design to a workable AutoCAD MEP for the duct shops.  I have followed the steps to export the duct from revit to AutoCAD mep but for those who do not have CADmep add in subscription, the only receive useless blocks.  I need to convert the duct from revit to autocad and I thought this would do it. I may be doing something wrong but if anyone can help, I would greatly appreciate it.