The internal structure of a brick chimney

The mantel, the fireplace and logs of wood grilles are components of a fire that almost all the world can identify. However, if you own a brick fireplace, you also need to know the names of the internal parts. Familiarize yourself with the structure from the inside out, giving you a better understanding of the components and mechanical parts that keep your fireplace working properly.


As the foundation of a house is important, it is also the basis of a fireplace. A fireplace installed properly will have a -o base shoe as it is called in some areas-which are independent of the house.

Interior home

The area directly below the fire is called the “home interior” and serves as the floor of the combustion chamber which extends from within the firebox into the room. Hearth area is inside the room known as the “outside hearth”. The floor of the indoor fireplace is where the ashes are then deposited from burning logs and should be routinely sweep to remove them once they are no longer the hot ashes and embers were extinguished.

Stop walls

Abutment walls forming the perimeter of the fireplace and enclose the combustion chamber, from the bottom and up to the bottom of the chimney at the point where its structure begins. Chimneys and drives “zero space” (prefab fireplaces installed directly into walls butt) are installed to fit right into the walls to stop.

The firebox

The flanks of the fire that line the inside of this form the “firebox” which is where you build the fire with logs. Fireplaces and space units serve zero fireboxes in homes where they are installed. In the oldest houses with brick chimneys, the section of the abutment walls is visible from inside the room serves as the firebox area. It box if combustion is an insert or tope- walls should have the appropriate size and should be tilted so that the heat of the fire is issued in the room.

Smoke platform

The air from the outside can create a downdraft in the chimney. The work platform is smoke downdrafts redirect back to the tube comes out of the chimney. Smoke platform has a curved upper surface to redirect smoke and protrudes from the back of the stop walls, which are located behind the flap and the firebox.


The damper is a plate or a valve that regulates air currents when the duct is closed. It is manually operated and must be fully open before lighting a fire, which is usually done by rotating the damper. The gate opens to ensure that smoke up the chimney instead of into the room and directs heat to flow into the room from the combustion chamber.


The canal is the passageway of the fireplace. Function is to create a flow conduit for the smoke to rise up the chimney and exit to the outside. The current start and extend vertically from the combustion chamber to the top of the chimney. When chimneys are inspected, the ducts are monitored to ensure they are not leaking and are operating properly.


Next to the home, the fireplace is probably the most recognized part of the structure, but many people are not sure where to start. The vertical area starts just after the smoke chamber is when “officially” begins. The fireplace is made of masonry walls surrounding the duct, duct liner, flashing and other mechanisms that are essential to make a fireplace malfunction.