A fireplace feature is composed of several components, including a HOB (3 letters), GRATE (5 letters), HEARTH (6 letters), FLUE (4 letters), and MANTEL (6 letters). The HOB is the opening at the bottom of the fireplace where air and fuel enter. The GRATE is a metal frame that holds the fuel in place. The HEARTH is the floor of the fireplace, usually made of stone or brick. The FLUE is the duct that carries smoke and gases up and out of the chimney. The MANTEL is the decorative shelf above the fireplace.