LG MHEC1737F INSTALLATION - Page 8

us_main.book.book Page 8 Thursday, November 25, 2021 10:15 AM 8 INSTALLATION g 3 1/4" x 10" to 6" round duct transition Roof Venting The oven is located on an outside wall near the roof: 3 1/4" x 10" duct d or minimum 6" diameter round duct e. a Cabinet b Oven c Roof Cap d 3 1/4" x 10" duct e Minimum 6" diameter round duct f 3 1/4" x 10" to 6" round duct transition NOTE • If you choose the rear exhaust method (wall venting or roof venting), be sure there is enough clearance within the wall for the exhaust duct. NOTE • The ductwork you need for outside ventilation is not included with your oven. See the standard ductwork fittings. Standard Ductwork Fittings If the existing duct is round, you must use a rectangular-to-round adapter, with a rectangular 3" extension duct installed between the damper assembly and the adapter to prevent the exhaust damper from sticking. Duct Length The total length of the duct system, including straight duct, elbows, transitions, and wall or roof caps must not exceed 140 feet. For best performance, do not use more than three 90 degree elbows, and keep the length as short as possible. Below are the standard fittings and their equivalent length in feet. 3 1/4" x 10" to 6" transition = 5 ft 3 1/4" x 10" roof cap = 24 ft 3 1/4" x 10" 90° elbow = 25 ft 90° elbow = 10 ft When Installing Venting • Keep the length of the ductwork and the number of elbows to a minimum to ventilate your oven efficiently. See examples in next section. • Keep the size of the ductwork the same. • Do not install two elbows together. • Use duct tape to seal all joints in the duct system. • Use caulking to seal the exterior wall or roof opening around the cap. • After installation, check the outside hood opening and operation. • For the outside hood opening and size refer to the upper cabinet template or rear wall template. 3 1/4" x 10" wall cap = 40 ft 45° elbow = 5 ft 3 1/4" x 10" flat elbow = 10 ft To calculate the equivalent length of each duct piece used, see the examples below. For 3 1/4" x 10" systems