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Our house is a 1000 sq foot ranch with a 500 ft Family Room Addition built on a slab. to get supply heat and a/c into the room, I had to run an 8"supply duct in my crawl space upt to my attic, a distance of 25 feet. Off of that I have 4- 6x10" vents on the perimeter walls that are fed by a 6"...