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The longest venting with three 90° turns is 36 feet.
Sorry, there was a problem. Please try again later.The maximum length of 4-inch (10.2 cm) diameter rigid metal duct with 3 90° Elbows is 36 feet. If you are in need of any assistance, have additional questions, or would just like to see our helpful tips, check us out on Twitter @LGUSSupport Facebook https://www.facebook.com/LGUSA/ ^CP
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