8Planning the InstallationPreparing for InstallationDuct Work Equivalent LengthseQuivAlent lengthspiece subtract piece subtract8” 90° elbow 7 feet 10” 90° elbow 5 feet8” 45° elbow 3 feet 10” 45° elbow 2 feet3¼” X 10”to round 90°transition25 feet3¼” X 10” to8”/10” roundtransition4 feetRoof cap * Wall cap withdamper ** The equivalent lengths of roof and wall caps vary withmodel and configuration. For equivalent length, contact themanufacturer or a qualified HVAC specialist.Duct Work Design TipsWherever possible, reduce the number of transitions•and turns to as few sharp angles as possible. Twostaggered 45° angles are better than one 90°.Keep turns as far away from the hood exhaust as pos-•sible, and as much space between bends as possible.For best performance, use round duct instead of rect-•angular, especially when elbows are required.If multiple elbows are used, try to keep a minimum of•24” straight duct between them.Avoid “S” or “back to back” use of adjacent elbows.•In regions where the weather gets extremely cold, use•thermal breaks, such as a short section of non-metallicduct, to avoid indoor heat loss. Locate the break asclose as possible to the outside pass through point.Do not use flexible metal duct.•Do not• use duct work that is smaller in cross-sectionalarea than the recommended types above.Verify the Package ContentsUnpack the parts box and verify that all parts have beenincluded according to the parts list on page 5. If any itemis missing or damaged, please contact the dealer immedi-ately. Do not install a damaged or incomplete appliance.Make sure you have everything necessary for proper instal-lation before proceeding.Mounting Location PreparationwArningThe electrical service to the range hood should be•installed only by a licensed electrician.Observe all governing codes and ordinances during•site preparation and installation. Contact your localbuilding department for further information.Failure to properly anchor the hood to the wall may•result in personal injury due to the unit falling off thewall.To avoid an electric shock hazard and property dam-•age, locate electric wires and water pipes and avoiddrilling or cutting in the vicinity.Use the temporary mounting brackets only to hold•the hood in place until permanent anchoring isinstalled.Temporary mounting brackets, and the•screws and anchors to hold them in placeduring installation are provided with thehood. Two anchors and screws are usedper bracket.Determine the number, size and type of•anchors required to attach the hood permanently to thewall and/or the cabinets based on the type of installa-tion and the weight chart on page 3.Make sure the mounting surface is properly reinforced•to handle the full weightof the hood. If mountingthe unit to a drywall orplastered surface, installa reinforced mountingblock between the studsbehind all hood mountinglocations. You may attachscrews directly to thestuds and cabinets if theyline up with the mountingholes in the back and topof the hood. If mount-ing the hood to brick ormasonry, select anchorscapable of holding the fullweight of the hood.