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IMPORTANT: This appliance must be exhausted outdoors
unless you are using the Recirculation Accessory Kit. See the
"Accessories" section in your Use and Care manual to order.
Do not terminate the vent system in an attic or other
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enclosed area.
Vent system must terminate to the outside.
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Use only a 3Z\v" x 10" (8.3 cm x 25.4 cm) rectangular metal
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vent or 6" (15.2 cm) round metal vent. Rigid metal vent is
recommended. Do not use a plastic or metal foil vent.
Before making cutouts, make sure there is proper clearance
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within the wall or floor for the exhaust vent.
Do not cut a joist or stud unless absolutely necessary.
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If a joist or stud must be cut, then a supporting frame must
be constructed.
The size of the vent should be uniform.
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The vent system must have a damper.
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Use vent clamps and aluminum metal duct tape to seal all
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joints in the vent system.
Use caulking to seal exterior wall or roof opening around
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the cap.
Determine which venting method is best for your application.
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For Best Performance:
Use 26-gauge minimum galvanized or 25-gauge minimum
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aluminum metal vent. Poor oquality pipe fittings can reduce
airflow. For external venting, a flexible metal vent is not
recommended.
NOTE: Local codes may require a heavier gauge material.
Metal duct may be reduced to 30-gauge galvanized steel
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or 26-gauge aluminized steel if allowed by local codes.
This reduction is based on information in the International
Residential Codes Section M1601.1 (2006 edition).
Avoid installing 2 elbows together.
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Use no more than three 90° elbows.
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If an elbow is used, install it as far away as possible from
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the hood's vent motor exhaust opening.
Make sure there is a minimum of 18" (45.7 cm) of straight
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vent between the elbows if more than one elbow is used.
Elbows too close together can cause excess turbulence
that reduces airflow.
Do not use a 5" (12.7 cm) elbow in a 6" (15.2 cm) or
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31/4" x 10" (8.3 cm x 25.4 cm) system.
Do not reduce to a 5" (12.7 cm) system after using a
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6" (15.2 cm) or 31/4" x 10" (8.3 cm x 25.4 cm) fitting.
Avoid forming handmade crimps. Handmade crimps may
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restrict airflow.
Use a Jenn-Air
vent cap for proper performance. If an
®
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alternate wall or roof cap is used, be certain the cap size
is not reduced and that it has a backdraft damper.
Use vent clamps and aluminum metal duct tape to seal all
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joints in the vent system.
Use caulking to seal exterior wall or roof opening around
■
the cap.
The length of vent the system and number of elbows should be
kept to a minimum to provide efficient performance.
The maximum equivalent length of the vent system is 35 ft
(10.7 m). For altitudes above 4,500 ft (1272 m), reduce
recommended vent run by 20% for best performance.
10
Venting Requirements
Cold Weather Installations
An additional backdraft damper should be installed to minimize
backward cold air flow and a thermal break should be installed
to minimize conduction of outside temperatures as part of the
vent system. The damper should be on the cold air side of the
thermal break.
Makeup Air
Local building codes may require the use of makeup air systems
when using ventilation systems greater than the specified CFM
of air movement. The specified CFM varies from locale to locale.
Consult your HVAC professional for specific requirements
in your area.
Venting Methods
Common venting methods are shown for a counter-mounted
downdraft vent cooktop. The cooktop may be vented through
the wall or floor.
Option 1 – Roof Venting
A
A. 6" (15.2 cm) round ducting
transitioned to 3
(8.3 cm x 25.4 cm)
rectangular floor venting
B. Roof cap
Option 2 – Wall Venting
B
B
A
A. 6" (15.2 cm) round ducting
/
" x 10"
1
B. Wall cap
4
Option 3 – Venting Between Floor Joist
Front view of cabinet with doors removed
B
A
A. 6" (15.2 cm) round
wall venting
B. Wall cap
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