fireplace
Masonry structure topped with a chimney and open in front; burning wood emits heat that is reflected from the inner hearth.
base 
Pedestal protecting a room’s floor from the heat produced by the fireplace.
hood 
Part of a fireplace located above the mantel; it hides the chimney and allows the smoke to escape to the outdoors.
jamb 
Vertical facing making up the side of the hearth and supporting the upper parts of the fireplace.
corbel piece 
Piece protruding from a jamb or wall; it supports the mantel of a fireplace.