In architecture, a chimney-breast is the horizontal projection of a chimney from the wall in which it is built. The term is commonly applied to its projection in the inside of the building only. Research Chimney-Breast
In architecture a mantel is the finish around a fireplace, covering the chimney-breast in front and sometimes on both sides. The term is especially applied to a shelf above the fireplace, and its supports. The mantelpiece or mantelshelf as it was formerly known was originally designed as a shelf for hanging clothes from so as to dry them from the heat of the fire. Research Mantel
 
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