how deep is a fireplace mantel
Also, make sure that the chimney extends the proper height above your roof or the fireplace won't draw. Most building codes require that the firebox be at least 20 inches deep (except for a different style of fireplace, called a Rumsford, which can be 12 inches) Check YOUR local building codes. Also, make sure that the chimney extends the proper height above your roof or the fireplace won't draw. Minor edit?