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Hello, please refer to page 10 of the Use and Care Manual for Mounting Height, Clearance, & Ducting instructions. A minimum of 7” round for AK25 or 3-1/4” x 10” rectangular duct must be used to maintain maximum air flow efficiency for vertical ducting. For horizontal ducting, 3-1/4” x 10” rectangular duct is the minimum size. Thank you for your inquiry! -Zephyr
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