A fireplace insert is like a wood stove that
has been modified by its manufacturer to fit within the firebox of a masonry
fireplace. Inserts are used to convert masonry fireplaces, which are
inefficient and polluting, into effective heating systems. An insert
consists of a firebox surrounded by a steel shell. Air from the room flows
between the firebox and shell to be warmed.
The outer shell ensures that most of the heat from the firebox is delivered
to the room instead of being released into the masonry structure. A
decorative faceplate covers the space between the insert body and the
fireplace opening.
Granite