mannerofspeakin
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House built in 1990. Need to replace a run of flexible duct work. The ductwork that needs replacing has a "9'" stamped on it next to its manufacturer information on the outside, which should mean 9 inch duct right ? I guess my trouble is that I can't find 9 inch flexible duct easily or at all. Any ideas ? This duct feeds three vents. Other ducts coming from air handler are this same size while others are 10 inch.