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.
Best Answer: The official source is the outlet at the northern end of Lake Itasca, Minnesota; there is a nice monument there, and you can wade across the river on stepping stones. But it is in fact possible to go upstream from Lake Itasca, as a number of streams, mostly unnamed, empty into the basin.