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Dryer Vent Duct Diameter

Pro tip Use no more than 25 feet. of 4-inch duct, and subtract 5 feet for every 90-degree turn and 2 12 feet for every 45-degree turn for dryer vent installation. For example, a dryer with a 90-degree elbow at the exhaust port and another at the top of the basement wall can run a maximum of 15 feet.

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