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I have a 1970's 1100 sq ft ranch on a slab. The return duct is in the attic and is in need of replacement. Instead of putting a new return duct back into the attic, I would like to move it into the conditioned space.
There is only one large return vent, located in the hallway between the bedrooms. It would be about a 30ft. run of duct from the furnace, with three 90 deg elbows. An online ductalator calculated the diameter of a round duct at around 14.5" for my 2 ton system.
The best size for where I want to put the duct would be a 14" max diameter. Would a 14" duct work or would I need to move up to the 16"? Thank you for any help.