Dacor Renaissance RNIVS2 Installation Instructions Manual

Also see for Renaissance RNIVS2: User manual

Contents

Dacor Renaissance RNIVS2 Installation Instructions Manual Manual pdf 14 page image

13Preparation and SetupDuct 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, a certain length mustbe subtracted from the maximum duct run to compensatefor wind resistance.Use the chart below to determine the maximum length ofyour duct run:1. Write the total length of your duct run, then2. Subtract all of the ductwork equivalent lengths in thechart 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 feet3¼ in x 10 into 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.Ductwork TipsWherever possible, reduce the number of transitions, turns,and sharp angles. Two staggered 45° angles are betterthan one sharp 90° angle.Keep turns as far away from the RNIVS exhaust as pos-sible, and keep as much space between any bends as pos-sible.For best performance: use round duct instead of rectangu-lar, especially when elbows are required.If multiple elbows are used, try to keep at least 24 inches ofstraight duct between each elbow.Avoid using “S” or back-to-back adjacent elbows.In extremely cold weather regions, use thermal breaks, i.e.,short sections of non-metallic duct, to avoid indoor heatloss. Locate the break as close as possible to the outsidepass-through point.Do not use flexible metal duct. Do not use ductwork that issmaller than what is advised in the tables.To prevent backdrafts, a damper at the duct outlet mayalso be required.Planning 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 ATD10. See page 12 for details.• Fasten all joints with sheet metal screws and seal withcertified duct tape or foil tape.• When planning new ductwork, always look for theshortest, most direct route to the outside.• To prevent a backdraft, never decrease the duct sizeover the run. If existing ductwork is smaller than 8inches in diameter, remove it and replace it with 8-inchductwork.WARNINGDuring duct installation, make sure there are noobstructions that keep the damper flaps on the top of thehood from opening.