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.
Valley River. The Valley River is a tributary of the Hiwassee River that begins as a pair of springs in the Snowbird Mountains of Cherokee County, North Carolina and descends 2,960 ft in elevation in approximately forty miles to enter the Hiwassee embayment at Murphy, North Carolina.