A chimney is a vertical structure that is typically attached to the side of a building. It is used to ventilate air and gases, such as smoke and fumes, from the inside of the building to the outside. In most cases, a chimney is used in conjunction with a fireplace or furnace, and it is designed to allow the smoke and gases from the burning fuel to be safely released into the atmosphere. The structure of a chimney typically consists of a flue, which is the vertical passageway through which the smoke and gases travel, and a chimney cap or crown, which is the top portion of the chimney that covers the opening and protects it from the elements.
