GE JVB67HBB Installation Instructions - Page 8

Installation Instructions DUCTWORK LENGTH AND DUCT FITTINGS NOTE: Do not exceed 150 foot maximum permissible equivalent lengths! Flexible ducting: If flexible metal ducting is used, all equivalent feet values in the table should be doubled. The flexible metal duct should be straight and smooth and extended as much as possible. DO NOT use flexible plastic ducting. Add equivalent lengths for all duct pieces and transitions used to ensure that the duct run does not exceed the maximum 150 feet. Duct Pieces Equivalent Length* Duct Pieces Equivalent Length* 6″ Round Straight 1 ft. (per foot length) 31⁄4″ x 10″ 45° Elbow 5 ft. 31⁄4″ x 10″ Straight 1 ft. (per foot length) 6″ 90° Elbow 15 ft. 6″ 45° Elbow 9 ft. 31⁄4″ x 10″ 90° Elbow 16 ft. 31⁄4″ x 10″ 90° Flat Elbow 6″ Round to 31⁄4″ x 10″ Transition 31⁄4″ x 10″ to 6″ Round Transition 6″ Round to 31⁄4″ x 10″ Transition 90° Elbow 24 ft. 7 ft. 5 ft. 20 ft. SHOULD NOT EXCEED 150 EQUIVALENT FEET *Equivalent lengths of duct pieces are based on actual tests conducted by GE Evaluation Engineering and reflect requirements for good venting performance. See chart for CFM Duct Length. Duct Pieces 31⁄4″ x 10″ to 6″ Round Transition 90° Elbow 6″ Round Wall Cap with Damper 31⁄4″ x 10″ Wall Cap with Damper Equivalent Length* 12 ft. 21 ft. 27 ft. 6″ Round Roof Cap 20 ft. 6″ Round Roof Vent 24 ft. 13