1. Feature lines
2. Define Part Size (rectangular or round)
3. Run the command Duct Creation 
4. Select part family and part size 
5. Assign Elevation and distances 
6. Save the setting you can use again
7. Select the feature lines
8. Enjoy with duct modeling

Rename the ducts related to alignment

The installer that ran when you downloaded this app/plug-in from the Autodesk App Store will start installing the app/plug-in. OR, double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, or rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 10/11) and uninstall as you would any other application from your system.