If the equipment is going to be based off of the same ceiling level, then you should use the same Reference Plane (or Level) to host them both. As I mentioned previously, Ducts must be associated with a Level, not a Reference Plane.
River Itchen. The River Itchen is a beautiful chalk stream which flows for approximately 28 miles from mid-Hampshire to Southampton.he source of the Itchen is situated in Cheriton, near Alresford, and flows down to the historic city of Winchester passing through nature reserve Winnall Moors, and Winchester City Mill.
The source of the River Hull is in the Yorkshire Wolds. It rises from a series of springs to the west of Driffield, near the site of the medieval village of Elmswell. The Elmswell Beck flows eastwards from these, and is joined by the Little Driffield Beck, which flows southwards from Little Driffield.