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 river is located on the Alaska Peninsula. Its watershed originates in the Aleutian Range before it flows westward from Becharof Lake into Bristol Bay via Egegik Bay, an arm of Kvichak Bay. Egegik rapids are reported at the outlet of Becharof Lake. The town of Egegik is situated at the mouth of the river. White bluff is situated on the river's north shore, just inside Cape Chichagof at Bristol Bay. The major tributaries are Kejulik River, Shosky Creek, and King Salmon River. The King Salmon River, which drains the area between Becharof and Naknek lakes, is the principal tributary to the Egegik from the north. Being 60 miles (97 km) in length, it enters about 7.5 miles (12.1 km) from the mouth of the Egegik.