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Hello. This model does not have to be vented outside. It can be installed as a non-vented (recirculating) microwave. Thank you for checking with us. Olga@Haier
Sorry, there was a problem. Please try again later.It does both. You can use it in a recirculation-only mode which is the way the unit is configured out of the box. However, if you wanted to NOT recirculate and instead vent to the outside, it does come with a conversion kit to make that possible as well. But it's not required.
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