Chimneys operate based on the principle that hot air is less dense than cold air, and thus rises. When a chimney is filled with hot smoke or other gases, these gases rise up through the chimney. The hot, rising gas creates a pressure difference known as a draft which pulls combustion gases out of the building.
How a Chimney Works?
A chimney is a vertical shaft or duct that carries hot gases and smoke from a fireplace, furnace, stove, or other combustible fuel burning appliance to the outside of a structure. The purpose of the chimney is to draw the smoke and gases away from the living space of the building and release them into the atmosphere.
Chimneys are typically constructed of masonry materials such as brick, stone, or concrete. The interior walls of the chimney are lined with a material that is fire resistant and non-combustible. The liner also helps to create an updraft to draw the smoke out of the structure.
At the bottom of the chimney is the firebox. This is the area where the combustible fuel is burned. The firebox is typically constructed of firebrick and is lined with a refractory material to protect the masonry walls from the intense heat of the fire.
Above the firebox is the smoke chamber. This area is designed to help create an updraft and draw the smoke up the chimney. The walls of the smoke chamber are angled so that the smoke is forced to swirl around and up the chimney. The smoke chamber also helps to cool the smoke and reduce the potential for chimney fires