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Yes, I've gone up in attic and no sign of the duct emerging anywhere up there. I suspect it either terminates somewhere in 2nd floor wall near top of wall cavity or else goes into space above the garage ceiling. I can't get into that space to look without breaking a hole into ceiling wall...

There is no room over the garage but a bedroom over the dining room. There is one heat supply register in this bedroom and I have traced it back to a different branch from the main trunk. I also checked and the floor trusses for 2nd floor run parallel to the wall this mystery supply duct runs...

Hello all. Purchased a 5 year old home this past winter. I am preparing to start finishing the basement and was removing insulation from ceiling to move some wiring and noticed a supply duct coming off main trunk from hot air system that runs inside ceiling joist, then turns up into the wall...