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Sorry Sid, my dumb ass didn't read your post carefully. The return air is in that room? If so, then all the cold or hot throughout the whole is going there because that's where its sucking all the air back into the system. Since, its the last register or outlet on the line, there's really no reason its blowing stronger then others unless the others has bends in the line leading to it. How big is that duct behind that grill? You might be able to sneak in there and install a damper. It should fit pretty tight but it has to be sheet metal screwed to the metal round duct. Ideally, it should be install in the attic or upstream somewhere to prevent air velocity associated with noise. If you decided that you feeling crawling, find out the size of the flex duct (should be since its a newer house) and cut open and install damper and tape the heck out of it. This will force the air to the other outlets upstream.
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