Planning Guide

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PLANNING
GUIDE
7.13
The factory default direction is through the top A of the hood.
However, the blower can be rotated to vent through the rear B
of the hood.
When planning new ductwork, always find the shortest, most
direct route to the outside.
Duct Length Calculation Table
The maximum straight duct length for the hood is determined by
the type of duct used. See the chart below.
Duct Size 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 elbow and transition added, a certain length must be
subtracted from the maximum duct run to compensate for wind
resistance.
To determine your maximum length:
1. Start with the total max. length of your duct run, then
2. Subtract all of the ductwork equivalent lengths (see the chart
below).
Ductwork Equivalent Lengths
Piece Subtract Piece Subtract
8-inch
90° Elbow
7 feet 10-inch 90° Elbow 5 feet
8-inch
45° Elbow
3 feet 10-inch 45° Elbow 2 feet
3-in x 10-inch
to Round 90°
Transition
25 feet
3¼ in x 10 in to 8
in / 10 in Round
Transition
4 feet
Roof Cap *
Wall Cap with
Damper
*
* The equivalent lengths of roof and wall caps vary with model and
configuration.
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 interrupt the proper flow of smoke and
combustion gases from furnaces, gas water heaters, and
fireplaces. To avoid drawing lethal gases into the home,
follow the manufacturer’s recommendation for these devices
and consult NFPA and ASHRAE recommendations.
• Failure to install a remote blower or proper ductwork may
result in a backdraft and/or insufficient venting of smoke and
fumes.
• DO NOT install an additional in-line or external blower to
increase the length of the duct run. Even small differences
between blower air flow rates can greatly reduce the air
draw by the hood.
CAUTION
To reduce the risk of fire and to properly exhaust air, be sure to
duct air outside the house or building. Do not vent exhaust air
into spaces within walls or ceilings or into attics, crawl spaces 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).
The specified rate varies based on locale. Consult a
qualified HVAC specialist when designing the system
for the requirements in your area and to assure optimal
performance.
◊ All ductwork materials (including screws and foil tape) must
be purchased separately.
◊ Make sure ductwork does not interfere with floor joists or
wall studs.
◊ Fasten all joints with sheet metal screws and seal with
certified duct tape or foil tape.
◊ Two 8-inch exhausts may be merged into one 10-inch duct
using Dacor transition kit AHT10.
WARNING
During duct installation, make sure there are no obstructions that
keep the damper flaps on the top of the hood from opening.
RNHP
Renaissance
®
30”, 36”, 48” Wide
Wall Mount Range Hood
Document # PG07-009
Revised 04/21/2016 Page 4/4
A B
Vent Direction Options