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 official source of the Mississippi River is Lake Itasca in northern Minnesota. On a visit to the lake I waded across the Mississippi as it flowed from the lake over the shallow rocks. Not far from Lake Itasca is Elk Lake, with an overflow leading into Lake Itasca.