Convection microwave uses internal fan to move air around inside the cooking area while the fan switch on the microwave operates the "stove vent fan" that moves air from the stove area to the outside. That covered outside vent has two flappers, one plastic one that is part of the plastic cover and an aluminum one that is part of the microwave. If you look when the stove vent fan is on, you will see the plastic flap open, but the metal one only partially open due to hanging up on something. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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