Hi Aaron,

Thank you for your question and for contributing to the Autodesk Community Forums!

I understand you are unable to see some HVAC ductwork utilizing and experiencing an error while opening a Fabrication dwg in Autodesk® DWG TrueView™. The probably cause for this is the Fabrication CADmep Object Enabler dbx file does not load properly in DWG TrueView™.

To resolve the issue perform the following steps in DWG TrueView:

• Access the DWG TrueView options (NOTE: an open drawing is required to access the options)
  • Right-click in the command bar at the bottom of the screen > Options
  • OR
  • ​Click the DWG TrueView button in the upper left corner > Options
• In the "Files" tab, expand "Support File Search Path"
• Click "Add..."
• Click "Browse..." and navigate to the DBX folder of the Object Enabler installation:

            C:\Program Files\Autodesk\Fabrication <version>\CADmep\DBX

            - Where <version> refers to the installed Object Enabler version

• Click "OK" to add the path
• Click "OK" in the Options dialog
• Close and restart DWG TrueView

See Also
Autodesk Fabrication CADmep 2016 Object Enabler
Autodesk Fabrication CADmep 2015 Object Enabler
Fabrication CADmep objects do not display in DWG TrueView

If my post answers your question, please click the "Accept as Solution" button. This helps everyone find answers more quickly!

Jarrett Porter

Technical Support Specialist