If you are running a flexible bent or semiridgid metal the distance is half what the manufater says on the manual, if it is a ridgid metal you can run all the lenght allowed by manufactur but there are brands that allow 60 feet but an average is around 20 with no ridgid and 40 with ridgid material, always metal.

Check specs in this link:

Http://www.appliance411.com/faq/dryer-vent-length.shtml


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