Look up the chimney, do you see a damper? What no chimney!, then the set is
Vent free would bother me, all combustion makes carbon dioxide and some
monoxide. I would not leave it running unless I was awake. I do not even
leave my vented set running when I am not vertical.
Can't happen. If you wake up you're not dead.
Assuming that there is no flue above the fireplace you should be able to
see a vent on an exterior side wall if it's vented. Also, if it's
vented the fire will most likely change (become more active) if a nearby
door or window is opened.
I guess I explained it wrong. It is a normal woodburning masonry
fireplace, with a damper. It has had gas logs installed. I'm trying
to figure out if I can run them with the damper closed.
And your wrong about waking up dead. Lots of people do. I see them
Vent free are required to have a set of metal plates attached to the burner.
Has the manufacturer, model number, and a statement that they are vent free.
If you would like to email me a picture, I can tell you also.
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