Jenn-Air JGD8348CDP Installation Instruction - Page 5

■ 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 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 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 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 counter-mounted downdraft cooktop. The cooktop may be vented through the wall or floor. Option 1 - Roof Venting Option 2 - Wall Venting B B A A A. Roof cap A. 6" (15.2 cm) round wall venting B. 6" (15.2 cm) round roof venting B. Wall cap Option 3 - Venting Between Floor Joist Option 4 - Venting behind Cabinet Kick Plate A B A. Wall cap B. 6" (15.2 cm) round wall venting A B A. Wall cap B. 6" (15.2 cm) round wall venting Concrete Slab Installations - Exhaust Through Wall B A D E F N C G M L K H I J A. Wall cap B. 6" (15.2 cm) round metal vent C. 16" (40.6 cm) maximum D. 6" (15.2 cm) round PVC sewer pipe E. 6" (15.2 cm) round metal vent F. 6" (15.2 cm) round PVC coupling G. Concrete slab H. 6" (15.2 cm) round PVC sewer pipe I. 6" (15.2 cm) round 90° PVC sewer pipe elbow J. Tightly pack gravel or sand completely around pipe. K. 30 ft (9.1 m) max. L. 6" (15.2 cm) round 90° PVC sewer pipe elbow M. 6" (15.2 cm) round PVC coupling N. 12" (30.5 cm) minimum Calculating Vent System Length To calculate the length of the system you need, add the equivalent feet (meters) for each vent piece used in the system. Vent Piece 6" (15.2 cm) Round 45° elbow 2.5 ft (0.8 m) 90° elbow 5.0 ft (1.5 m) 6" (15.2 cm) wall cap 0.0 ft (0.0 m) 5