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Exhaust duct systems longer than specified will: Accumulate lint creating a potential fire hazard. Shorten the life of the dryer. Reduce performance, resulting in longer drying times and an increased energy usage. 2 Determine the number of elbows/bends you will need. 3 In the column listing the type of metal duct you are using (rigid or thick wall flexible metal), find the maximum length of metal duct on the same line as the number of elbows/bends to be used (refer to page 15). 15Installation in