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 Upper Mississippi is the portion of the river where the river begins. The Mississippi river starts at Lake Itasca, in the central north of Minnesota. Lake Itasca is a small glacial lake approximately 4.7 km 2 (1.8 sq mi.) in area. It is located in the Itasca National Park and is 450 m (1,475 ft) above sea level.