Chimney structure constructed by traditional methods of either brick block stone or ul listed systems that contain the products of combustion from the interior of the home to the atmosphere.
Chimney flue damper diagram.
Diving even deeper down the rabbit hole the all important damper is located inside the flue.
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The chimney houses the flue which is just the airway in which the smoke rises from the fireplace and exits through the roof.
A prefab fireplace generally has a firebox of cast refractory panels and usually some metal is visible in the room all around the firebox.
If you look up past the damper you will see a round metal chimney.
And above the roof is more round metal chimney sometimes surrounded by a simulated brick housing.
Damper the mechanism used to open and close the flue allowing smoke to exit the chimney.
The flue can either extend up vertically through the ceiling go out at an angle through an external wall or extend up to the roof through the inside of a chimney.
Below is a diagram of a typical fireplace and chimney.
The crown helps keep the inside of the chimney moisture free by diverting water away from the chimney.
Our wood burning stoves were installed within existing chimneys and so the stove pipes extend from the stoves vertically into the flues located within the chimneys.
The original and best source for chimney liners flue caps more.