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Hi! This microwave is designed for three types of ventilation. Outside top exhaust, outside back exhaust or recirculating. For more information about the installation and requirements you can check the user manual available on our website or you can contact us, and we will gladly assist you. Viri E. Insignia Support. https://www.insigniaproducts.com/contact-us
Sorry, there was a problem. Please try again later.This unit allows you to choose to blow the exhaust inside through the vent in front at the top of the unit. I think this is how the fan is set from the factory. Easy install.
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