Our Hearthstone stove ( looks like a Tribute ) has been here since 2015, bought new. Cleaned once. When I look above the firebox, I see a "cement, heat-resistant board" lying up there which looks like it forces the smoke and heat to move across the top / interior of the firebox and then go up near the front door on up to the stove pipe. Just below where that "board" sits I see what looks like the remains of another board that was removed, not all that neatly. I guess I'm wondering what should be there and what I'd want to buy to put a new one in.
https://www.hearthstonestoves.com/e...ainted/Matte/Manufactured/TRIBUTE/p/8040-4161
https://www.hearthstonestoves.com/e...ainted/Matte/Manufactured/TRIBUTE/p/8040-4161