Dacor RNHE48 Installation Instructions - Page 10

Preparation and Setup CAUTION To reduce risk of fire and to properly exhaust air, duct air outside the house or building. Do not vent air into wall spaces, ceilings, attics, crawlspaces, or garages. Cabinet-Layout Dimensions Min. Width of E: Upper-Cabinet Cutout, Appliance Width Models RNHP, RNHE E 3012, 3018 30 in. (76.2 cm) 3612, 3618 36 in. (91.5 cm) 4812, 4818 48 in. (121.9 cm) All tolerances: +1/16" -0", unless otherwise stated. Planning the Ductwork WARNING • To prevent combustion by-products, smoke, or odors from entering the home, and to improve efficiency, tape all duct joints securely. • Range hoods may impede proper flow of smoke and combustion gases from furnaces, gas waterheaters, and fireplaces. To avoid drawing lethal gases into the home, follow the manufacturer's directions for these devices and NFPA/ASHRAE recommendations. • Failure to install a remote blower or proper ductwork may cause a backdraft and insufficient venting of smoke/fumes. • DO NOT add an in-line or external blower to lengthen the duct. Even small differences between blower airflow rates can greatly reduce the hood's air draw. WARNING During duct installation, ensure the damper flaps on top of the hood can open freely. • Local building codes may require the use of makeup air systems with ventilation systems that move air greater than the specified movement rate (CFM). Specified rates depend on locale. When designing the system, consult a qualified HVAC specialist for requirements in your area and to ensure optimal performance. • All ductwork material (incl. screws and foil tape) must be purchased separately by the customer. • Ductwork must not interfere with floor joists or wall studs. • On dual-exhaust models, the two 8" exhausts may be merged into one 10" duct using Dacor transition kit AHT10. See page 15 for details. • Fasten all joints with sheet-metal screws, and seal with certified duct/foil tape. A B Venting Options Typically, the blower vents through hood top (A, above); however, the blower can be rotated to vent through the hood rear (B). When planning ductwork, always find the shortest, most direct route to the outside. Duct-Length Calculation Table The type of duct determines the hood's maximum straight duct length. Duct Type 8-inch Round 10-inch Round 3 1/4-in x 10-in Rectangular Maximum Duct Run 60 feet 50 feet 50 feet For each new elbow and transition, you must subtract "equivalent lengths" from your total maximum duct run length to compensate for wind resistance. 8