My fault on the description. It is a wood burning factory built fireplace. It does have a flue vented through the roof. I originally thought that the flue was the source of combustion air, because it looked like a direct vent flue at the top. However there was no lever to open or close the incoming combustion air like I normally see. The damper can be opened and closed, but that was all that we could find.

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Jim Robinson
New Mexico, USA