I need to move the location of and change out the old ceiling round register in my sons kitchen. The goal is to move the register from the middle of the combo kitchen and breakfast room, near the cooktop exhaust, to over the kitchen window. This register shares a main supply which is approximately 28.5 in outside diameter with the dining room supply and its diameter is 19.0, both are Metal duct. I am assuming the 28.5 is 9"? and the 19.0 is 6"?
We will then run another, 6 or 7 inch separate new register in the breakfast area.
The existing supply line to the old round register in the kitchen is approximately 22.5 inches around the outside. So I am guessing that this older metal duct is 7"? does this sound right? Are there 7" boot registers?
digitalplumber is just a name for use here, I am not a plumber!