Dacor RNHP30 Renaissance Installation Instructions Manual

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Dacor RNHP30 Renaissance Installation Instructions Manual Manual pdf 11 page image

9Preparation and SetupThe blower direction is through top A of the hood.However, the blower can be rotated to vent through therear B of the hood.When planning new ductwork, always find the shortest,most direct route to the outside.Duct Length Calculation TableThe maximum straight duct length for the hood is deter-mined by the type of duct used. See the chart below.Duct Size Maximum Duct Run8-inch Round 60 feet10-inch Round 50 feet3 1/4-in x 10-in Rectangular 50 feetFor each elbow and transition added, “equivalent lengths”must be subtracted from your total maximum duct runlength to compensate for wind resistance.To determine your maximum length:1. Start with the total max. length of your duct run, then2. Subtract all of the ductwork equivalent lengths (seechart below).Ductwork Equivalent LengthsPiece Subtract Piece Subtract8-inch90° Elbow 7 feet 10-inch 90° Elbow 5 feet8-inch45° Elbow 3 feet 10-inch 45° Elbow 2 feet3-in x 10-inchto Round 90°Transition25 feet3¼ in x 10 in to 8in / 10 in RoundTransition4 feetRoof Cap * Wall Cap withDamper ** The equivalent lengths of roof and wall caps vary withmodel and configuration.A BPlanning the DuctworkWARNING• To prevent combustion by-products, smoke or odorsfrom entering the home and to improve efficiency, tapeall duct joints securely.• Range hoods may interrupt the proper flow of smokeand combustion gases from furnaces, gas water heat-ers, and fireplaces. To avoid drawing lethal gases intothe home, follow the manufacturer’s recommendationfor these devices and consult NFPA and ASHRAE rec-ommendations.• Failure to install a remote blower or proper ductworkmay result in a backdraft and/or insufficient venting ofsmoke and fumes.• DO NOT install an additional in-line or external blowerto increase the length of the duct run. Even small dif-ferences between blower air flow rates can greatlyreduce the air draw by the hood.CAUTIONTo reduce the risk of fire and to properly exhaust air, besure to duct air outside the house or building. Do not ventexhaust air into spaces within walls or ceilings or intoattics, crawl spaces or garages.• Local building codes may require the use of makeup airsystems with ventilation systems that move air greaterthan the specified movement rate (CFM). The specifiedrate varies based on locale. Consult a qualified HVACspecialist when designing the system for the require-ments in your area and to assure optimal performance.• All ductwork materials (including screws and foil tape)must be purchased separately by the customer.• Make sure ductwork does not interfere with floor joistsor wall studs.• On dual exhaust models, the two 8-inch exhausts maybe merged into one 10-inch duct using Dacor transitionkit AHT10. See page 19 for details.• Fasten all joints with sheet metal screws and seal withcertified duct tape or foil tape.Vent Direction OptionsWARNINGDuring duct installation, make sure there are noobstructions that keep the damper flaps on the top of thehood from opening.