Superior Model B1238 - What does the Open lever do?
I recently bought a home with a 25 year old Superior fireplace. It's a regular wood-burning unit. There's a sliding lever on the left side of the fireplace, behind the glass towards the bottom. It's a vertical lever with the label "Open" above it. I presume this is some kind of vent, such as to allow warm air to circulate around the back and sides.
Anyone else have something like this that can give a definitive answer on what it this lever is used for?