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I had the same question. I read the specifications since the answers provided weren't helpful. The specs say it is both internal (recirculated) and externally vented, with openings for external ducts in the back and on top. So, you have the option to vent externally through the back, through an external wall, straight up, or use the recirculation option.
Sorry, there was a problem. Please try again later.This is designed to be vented without outside access. I have not installed completely yet but it is made for a circular venting process through a filter.
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