By James Philip
In the dialogue box that appears select routing preferences.
Another dialogue box appears which has all of the connection settings.
The default fitting for transition is Concentric Taper. Use the load family button to import the Eccentric Taper. Once loaded it can be chosen to replace the Concentric Taper. However once applied the transition still appears concentric.
To rectify this, select each duct and choose Justify on the ribbon.
The ribbon then changes to display the justify option; choose the one you require.
The ducts should now be justified correctly.