I've got an old Kodiak fireplace insert that I believe was made by Alaska Stove Company. I'm trying to find out the purpose of the brackets inside of the firebox. They are at the rear and toward the top. They are about 4 1/2" from the top and the side brackets are about 7" from the back. The space between the side brackets is 3/4". I've been told that they may be for some sort of baffle to divert heat toward the front of the insert before it finds it's way out of the flue. If it is for a baffle, would it be made of steel and how thick would it be?