I currently have a fireplace and chimney.  The chimney does not go through the roof, it is open to the attic.  Can I use ventless logs in this application?  Do I need to plug the top of the chimney in the attic first?

The fireplace should be checked by a professional mason or check with the building codes be sure it will be safe to install ventless gas logs with the chimney disconnected in the attic.

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