Gas Log

Is there a way to tell difference between vented and vent free gas log sets? Mine is U shaped with 2 burners.?

I have no model number or any stickers on it anywhere.
This is going in a chimney, but I still need to know whether it is the vent free kind or not because I want to close the flue so I can keep the heat in. I need to know if there is a way to tell the difference between vented and vent free log sets, physically (my original question has not been answered).

If you have a vented fireplace it will not matter. You can use either type in a vented fireplace.

On a vented unit there will be a duct (chimney) to take the fumes away. If you are on the outside of the wall where it’s mounted, you will see a metal vent in the wall or straight above it you will see a chimney pipe.

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