The term FIREPLACE SECTION can be broken down into two crossword solutions: HEARTH (6 letters) and HOB (3 letters). The HEARTH is the floor of a fireplace, usually made of brick, stone, or concrete. It is the area where the fire is built and is often surrounded by a mantel. The HOB is the raised area around the fireplace, typically made of metal, which helps to contain the heat and protect the surrounding walls from the fire.