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If I were you, I would avoid this approach at all costs. It is possible to build a system of main runners, cross tees and wall angles to box in duct work, but it is usually more trouble than its worth. (it is very difficult to get the panels in the tight quarters, and to keep the vertical panels in place) I have done it many times myself, but it usually works best in commercial applications with higher ceilings. It will not look very nice, usually, in a residential environment. Plus, there is really no support for the grid system around the ducts as there is no place to attach your hanger wire.
Usually, I will frame ductwork with 2x4's or similar, and finish with drywall. That way, you can butt your suspended ceiling wall angles to the framing and drywall. Sometimes ceiling height is an issue in basements, however. If you do elect to box in the ducts with suspended ceiling components, you need to be fairly handy with a rivet gun. If you would like detailed instructions, please feel free to e-mail me, and I will send them along.