Jenn-Air JVD0303GS Installation Instruction - Page 10

Venting Requirements 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 enclosed area. ■■ Vent system must terminate to the outside. ■■ Use only a 3Z\v" x 10" (8.3 cm x 25.4 cm) rectangular metal 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 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. ■■ Use vent clamps and aluminum metal duct tape 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 26-gauge minimum galvanized or 25-gauge minimum 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 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. ■■ 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 3¼" x 10" (8.3 cm x 25.4 cm) system. ■■ Do not reduce to a 5" (12.7 cm) system after using a 6" (15.2 cm) or 3¼" x 10" (8.3 cm x 25.4 cm) fitting. ■■ Avoid forming handmade crimps. Handmade crimps may restrict airflow. ■■ Use a Jenn-Air® vent cap for proper performance. If an 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 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. 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 Option 2 - Wall Venting B B A A A. 6" (15.2 cm) round ducting transitioned to 31/4" x 10" (8.3 cm x 25.4 cm) rectangular floor venting B. Roof cap A. 6" (15.2 cm) round ducting B. Wall cap 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 10