Recommended Specifications: Clothes dryer exhaust ducts should be built of 4 inch, stiff metal pipeline with a smooth interior and joints running in the instructions of air flow. The versatile foil and vinyl types are considered to be a fire danger. The dryer duct ought to be as short and straight as possible. The optimum length for a clothes dryer duct is 25 feet; however, it should be minimized by 2.5 feet for each 45 degree turn and 5 feet for each 90 degree turn since bends limit air circulation.
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