I'm having a weird issue I can't quite figure out. Ideally we would be drawing in the correct service but I guess we don't live in a ideal world.
So..... Using Revit 18.3 with MEP fabrication parts. A duct run is drawing with a 4" service. In this example its just a couple straight joints with a volume damper in it. I highlight the run and use the change service command. I select a 2" service and click finish. The run is then switched to 2" but.... my volume damper turns into a access door. Its very strange. The similar task works correctly in CADmep. Access doors have different button codes then volume dampers. I have no idea why this is happening. I can exclude the access door from fill and change service, then the damper just stays 4" and is no longer connected to the duct.
Any ideas?