GE JGP989 Owner's Manual & Installation Instructions

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20Installation InstructionsDUCTWORK CALCULATIONSCalculate Total Equivalent Ductwork LengthEquivalent Number EquivalentDuct Pieces Length* x Used = Length6″ roundstraight 1 ft. x ( ) † = ft.31⁄4″ x 10″straight 1 ft. x ( ) † = ft.6″, 90°elbow 15 ft. x ( ) = ft.6″, 45°elbow 9 ft. x ( ) = ft.24″ max.flexiblemetal offsetadapter 34 ft. x ( ) = ft.31⁄4″ x 10″90° elbow 16 ft. x ( ) = ft.31⁄4″ x 10″45° elbow 5 ft. x ( ) = ft.31⁄4″ x 10″90° flat elbow 18 ft. x ( ) = ft.6″ roundto 31⁄4″ x 10″transition 7 ft. x ( ) = ft.Subtotal Column 1 = ft.*Equivalent lengths of duct pieces are based onactual tests and reflect requirements for goodventing performance with any downdraft cooktop.†Measure and list feet of straight duct used. Countand list the quantity of all other duct pieces for the“Number Used” of each type.IMPORTANT:For maximum efficiency, use the shortest andstraightest duct run possible, with as few fittingsas possible. For satisfactory performance, the ductrun should not exceed 100 feet equivalent length.Venting performance is improved by using largerdiameter duct.Equivalent Number EquivalentDuct Pieces Length* x Used = Length6″ roundto 31⁄4″ x 10″transition90° elbow 20 ft. x ( ) = ft.31⁄4″ x 10″to 6″ roundtransition 5 ft. x ( ) = ft.31⁄4″ x 10″to 6″ roundtransition90° elbow 12 ft. x ( ) = ft.6″ roundwall capwith damper 21 ft. x ( ) = ft.31⁄4″ x 10″wall capwith damper 27 ft. x ( ) = ft.6″ roundroof cap 20 ft. x ( ) = ft.6″ roundroof vent 24 ft. x ( ) = ft.Subtotal Column 2 = ft.Subtotal Column 1 = ft.TOTAL DUCTWORK = ft.Should not exceed 100 feet.DO NOT use flexible plastic ducting.Vent installation should not exceed 100 feetequivalent length.