What are my options if the distance to the outside is greater than code allows?
Answer You do have options. Currently most if not all mechanical codes allow for longer exhaust duct runs than 25 feet if the manufacturer of the dryer appliance specifies or allows for lengths exceeding the local governing mechanical code. In most cases you’ll have to provide the specs and related literature at time of mechanical rough and final inspections and may be required to have the respective appliance installed at final, but please concur this with your building inspector. My findings: I selected a mid-range priced dryer from each of the four big dryer manufactures, I reviewed each of their respective installation guides, and what I found will surprise you. Maximum exhaust distances with two elbows ranged from 26 feet to 44 feet, but were achieved by using hard rigid snaplock pipe in the walls, and a “box hood” or “louver style” weather hood. Click here to view the comparison of four dryer manufacturers’ installation specs. The other options are using the Fantech – Dryer Boost
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