I think I have a B-Vent, direct vent, or vent free fireplace, but I am not sure how to tell for certain what kind I have. It is a gas fireplace with the fake logs. I do not have an owner's manual nor can I see any marking to show me the Manufacturer or the model #. I do not have a chimney so that is why I believe it is on of the 3 listed above. The problem I am having is with the ventilation. When I light the fire it burns fine, but the gas fumes take over my house shortly afterwards. It's so bad that we cannot use the fireplace because of the possible health concerns. Any input is welcomed, but remember that you are dealing with the most amateur of amateurs when it comes to Fireplaces and the ventilation required.