My first 30 inch rafter mounted system was for Adam who bought a nice house for his wife and new baby – a one story with a big attic. He had a 30 inch ceiling mounted fan in his previous home but it was in the hall ceiling and noisy. He wanted our quiet and powerful 30 inch up hanging off the rafters. We installed it with two 18 inch ducts connected to his family room and a hallway. He went into his master bedroom, opened a window, and the wind blew the leaves on a faux tree 10 feet away. He commented that the sound was “not as much as his air conditioner”.