“Our new LG over the stove microwave, with external venting, seems to blow some air down onto the stovetop while the fan is on. Is this supposed to happen? Does it mean it’s not really venting to the outside?”
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It is considered normal for the LG 2.1 Cu. Ft. Over-the-Range Smart Microwave with Sensor Cooking and ExtendaVent 2.0 - Stainless Steel, Model: MVEL2137F, to blow air down onto the range below, even when configured for external venting. The main fan that exhausts smoke and grease out of your house (the range hood function) is different from the fan that cools the microwave’s internal components. The cooling fan often discharges air through the front or bottom of the unit, creating a slight, constant breeze when the microwave is in use. LG microwaves have an "auto vent" feature that senses heat from the cooktop below and turns on the ventilation fan automatically. This can cause air to blow even if you didn't manually turn on the fan, and it may continue for up to 30 minutes after cooking. The microwave’s vent fan should be turned on whenever you use the cooktop below it. The fan captures smoke, steam, and odors, and also prevents the heat from the cooktop from damaging microwave components. If the microwave is cooking, the vent fan turns on automatically if the sensors detect too much heat from the cooktop. This is designed to prevent microwave component damage...;^Ivan..
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