Fireplace wall vent question
My fireplace has 4 side vents. Two towards the bottom by the glass doors and two up above the mantel. As far as I know, they don't *do* anything. Maybe expel chimney heat, but there's no blower or anything. I was wondering if the top two could be removed and drywalled. They are very unattractive. I guess they are there for a reason, just not sure what? : ) Thanks!