The hearth support can also be supported by using corbelled brickwork of (). You can also use cantilevered reinforced brick masonry or even a structural slab of concrete .
The firebox is made up of a smoke shelf, the combustion chamber, throat and of course the fireplace opening. With regards to the heart there are the 2 primary parts, the extended hearth and also the inner hearth. The floor of the combustion chamber is created by the inner hearth which is located within the firebox area.
Projecting outwards into the room located behind the fireplace face is the extended hearth which is also noncombustible.
The opening of the fireplace is a major part of the design of the fireplace and most of the other components that make up the fireplace are based on the dimension and configuration of its opening.
The shape of the fireplace opening is also important, because the higher the opening, the more it will increase the glowing heat and also increase the demand for more air in the room and will definitely require a taller chimney.
The bricks used for support above the fireplace opening must have adequate support such as brick arches, reinforced brick masonry lintels, stone, pre-cast concrete and loose angle lintels. The dimensions of the firebox should be designed in such a way to allow the fire to fill the combustion chamber when it is lighting, as this will provide better heating effectiveness.
A firebox opening should be designed at the proper size because if the opening is too small, although it might function normally, it will not be able to provide enough heat to keep the room warm, in the same manner if it is too big, it will require a greater flue area and of course will use up huge amounts of the interior air.
The shape and depth of the combustion chamber plays a significant part with respect to the combustion air requirements and the amount of heat reflected and radiated into the room and will also influence the draft in the room.
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