Can I add extra System Types?
Yes you can add extra System Types but please note it’s not possible to add new System Classifications.
You do this from your family list in the Project Browser, under Duct Systems > Duct System. If you select which one you wish to use, i.e. Supply Air and right-click Duplicate. A new Supply Air 2 will be created. Then right-click and select Rename, to name it accordingly.