Q: I have a set of gas logs that are un-vented. Am I able to use the Chimney Balloon to completely seal off the outside air and use the fireplace at the same time? I have a damper and would keep it closed, but I would be afraid the "auto-deflate" option might kick in on me. - NE
A: Dear NE,
Even if it is a vent free gas log If you light a fire under a Chimney Balloon it will burst and deflate. The heat will sneak up past your damper and get the balloon to its burst temperature point.
However, it does benefit you to have the Chimney Balloon in while the vent-free gas log unit is not in operation. - Jason