Happy Thanksgiving SamuelsFamily:
Yes there is a wall size duct made measuring 3" X 12" and they work quite well. However, that size will just carry enough heat for a small room; like 10' x12', so one run of it will not do the whole upstairs. You might consider using one per room or two in a larger room. I would also recommend at least one run for a return air. Heat and air just work better when they circulate rather than just push.