A fireplace diagram includes the inner parts of the chimney, such as the chimney flue, the chimney walls, flue liner and the crown. The diagram also illustrates the parts of the fireplace found in the home, such as the mantle, smoke chamber, throat damper, smoke shelf and firebox. If a home has a basement, then the diagram shows the chimney's ash dump, ash pit and clean-out door.
The chimney flue, located within the chimney walls, is the pipe that carries smoke to the outside. The flue liner is a safety precaution, made of stainless steel or specialty tiles that help minimize debris accumulation. The chimney crown protects the chimney from water leakage from rain or snow melt.
The smoke chamber is toward the bottom of the chimney flue. The chimney damper may be opened or closed as needed, while the smoke shelf catches debris and helps the smoke navigate up into the chimney.
The parts of the fireplace typically seen in the home include the mantle, a feature that was once used for keeping smoke out of a home but today is mostly a decorative feature. The firebox is where the fire is built, usually on some sort of grate for better air flow. The hearth sits in front of the firebox, and the hearth extension, which keeps sparks inside the fireplace, is in front of the hearth. In fireplaces that end at the floor line, such as in some mobile homes, ash and debris are cleaned out directly from the firebox.
Fireplaces that extend into the basement may have an ash dump, an ash pit and a separate clean-out door. Diagrams for these types of fireplaces also usually show the foundation and footing of the fireplace in relation to the basement floor slab.