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Hi there. Please know that for the ExtendaVent to function properly, the over-the-range microwave must be vented to the outside through ductwork. The ExtendaVent cannot operate as a ductless or recirculating vent. Aside from MVEL2137F, models MHEC1737D, MVEF1337F, and MVEL2033D also have the ExtendaVent feature. -Charles
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