“What is the size or diameter of the connection to the external vent, for the external vented configuration?”
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If you are going to vent the LG 2.1 cu. Ft. Smart Over-the-Range Microwave with ExtendaVent®2.0 & EasyClean®, Model # MVEL2137F, through the roof or through the wall, the standard fittings and their equivalent length in feet are: • 3 1/4" x 10" to 6" transition = 5 ft. • 3 1/4" x 10" 90° elbow = 25 ft. • 90° elbow = 10 ft. • 3 1/4" x 10" wall cap = 40 ft. • 45° elbow = 5 ft. When Installing Venting, you will need to keep the length of the ductwork and the number of elbows to a minimum to ventilate your oven efficiently. 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. If you have existing duct that 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...^Ivan.
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