“Can this unit be vented with 4” duct vent without compromising its performance?”
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Hi Mike. The recommended ducting for the LG 2.0 cu. ft. Over-the-Range Microwave Oven with EasyClean®, Model # LMV2031ST is 3 1/4" x 10" and you have to transition to rectangular or rigid 6" round ducting. Transitioning it down to 4" is creating a type of restriction because you will be reducing the capacity by 2/3rds and that will affect the performance. The blower needs all the help it can get to exhaust the air. The unit cannot be ducted into a common duct work. Round ducts should be a minimum of 6"...^IFV
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