In my 25 year old home I have a brick fireplace which juts into the room. Around the corner from the fireplace is another opening (still brick). It is about 4 ft off the floor, 1-1/2 ft wide, 1-1/2 feet deep and 2 ft tall. It has it's own flue pipe, has an ash cleanout in the bottom and is lined with firebrick. There are 2 bricks jutting out from each side like they were meant to hold cooking racks. Has anyone seen anything like this?