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8
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.
Preparation and Setup
Cabinet-Layout Dimensions
A B
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.
• 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.
Venting Options
WARNING
During duct installation, ensure the damper flaps on top
of the hood can open freely.
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 air-
flow rates can greatly reduce the hood’s air draw.
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 Maximum Duct Run
8-inch Round 60 feet
10-inch Round 50 feet
3 1/4-in x 10-in Rectangular 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.
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