Venting Requirements
IMPORTANT: This range must be exhausted outdoors. See “Venting Methods” section.
■Do not terminate the vent system in an attic or other enclosed area.
■Use a
■Vent system must terminate to the outside.
■Use only a 6" (15.2 cm) round metal vent or a 3¼ x 10"
(8.3 cm x 25.4 cm) rectangular vent, except as follows:
5" (12.7 cm) round metal vent may be used for venting straight out the back of the range and directly through the wall for vent lengths of 10 ft (3.0 m) or less.
■Rigid metal vent is recommended. For best performance, do not use plastic or metal foil vent.
■Before making cutouts, make sure there is proper clearance within the wall or floor for the exhaust vent.
■Do not cut a joist or stud unless absolutely necessary. If a joist or stud must be cut, then a supporting frame must be constructed.
■The size of the vent should be uniform.
■The vent system must have a damper. If roof or wall cap has a damper, do not use damper supplied with the range hood.
■Use vent clamps to seal all joints in the vent system.
■Use caulking to seal exterior wall or roof opening around the cap.
■Determine which venting method is best for your application.
For Best Performance:
■Use
NOTE: Local codes may require a heavier gauge material.
■Metal duct may be reduced to
■Do not install 2 elbows together.
■Use no more than three 90° elbows.
■If an elbow is used, install it as far away as possible from the hood’s vent motor exhaust opening.
■Make sure there is a minimum of 18" (45.7 cm) of straight 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 3¹⁄₄" x 10" (8.3 x 25.4 cm) system.
■Do not reduce to a 5" (12.7 cm) system after using a 6" (15.2 cm) or 3¹⁄₄" x 10" (8.3 x 25.4 cm) fittings.
■Avoid forming handmade crimps. Handmade crimps may restrict airflow.
■Use a
■Use vent clamps to seal all joints in the vent system.
■Use caulking to seal exterior wall or roof opening around the cap.
The length of vent system and number of elbows should be kept to a minimum to provide efficient performance.
The maximum equivalent length of the vent system is
60 ft (18.3 m). For altitudes above 4,500 ft (1272 m), reduce recommended vent run by 20% for best performance.
Cold Weather Installations
An additional backdraft damper should be installed to minimize backward cold air flow and a thermal break 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 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 downdraft range. The downdraft range may be vented through the wall or floor.
Wall Venting
A
B
A. Wall cap
B. 6" (15.2 cm) round roof venting
Floor Venting
Venting Between Floor Joists
A
B
A. Wall cap
B. 6" (15.2 cm) round roof venting
5
