10Installation PreparationDUCTFITTINGS8VH[duct. It cantransition to 6"round.TotalEquivalent Quantity EquivalentDuct Piece Dimensions Length* Used Length1 ft. URXQG SHUIRRW VWUDLJKW OHQJWK1 ft. ø[ SHUIRRW VWUDLJKW OHQJWK6"90° elbow 12 ft.6"45° elbow 7 ft. ø[90° elbow 14 ft. ø[45° elbow 8 ft. ø[ ÀDWHOERZ IW6" round WRø[transition 2 ft. ø[round to 6"transition 2 ft.6" round to ø[transition90° elbow 4 ft. ø[WRround transition90° elbow 4 ft.6" roundwall capwith damper 24 ft. ø[wall capwith damper 24 ft.6" roundroof cap 33 ft.Total Duct RunUse this chart tocompute maximumpermissible lengthsfor duct runs tooutdoors.NOTE: Do not exceedmaximum permissibleequivalent lengths!$FWXDOOHQJWKRIVWUDLJKWGXFWSOXVGXFW¿WWLQJequivalent. Equivalent length of duct pieces is basedon actual tests conducted by GE Evaluation EngineeringDQGUHÀHFWUHTXLUHPHQWVIRUJRRGYHQWLQJSHUIRUPDQFHwith any downdraft cooktop.Downdraft Vent: 100' maximumequivalent lengthFlexible ducting:,IÀH[LEOHPHWDOGXFWLQJLVXVHGDOOWKHequivalent feet values in the table shouldEHGRXEOHG7KHÀH[LEOHPHWDOGXFWVKRXOGbe straight and smooth and extended asmuch as possible.'2127XVHÀH[LEOHSODVWLFGXFWLQJNOTE: Any home ventilation system, suchas a cooktop with a downdraft exhaustPHFKDQLVPPD\LQWHUUXSWWKHSURSHUÀRZof combustion air and exhaust required by¿UHSODFHVJDVIXUQDFHVJDVZDWHUKHDWHUVand other naturally vented systems. Tominimize the chance of interruption of suchnaturally vented systems, follow the heatingequipment manufacturer’s guidelines andsafety standards such as those publishedby NFPA and ASHRAE. When applicable,LQVWDOODQ\PDNHXS UHSODFHPHQW DLUV\VWHPin accordance with local building coderequirements. Visit GEAppliances.com foravailable makeup air solutions.