A chimney a structure for venting hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere. Chimneys are typically vertical, or as near as possible to vertical, to ensure that the gases flow smoothly, drawing air into the combustion in what is known as the stack, or chimney, effect. The space inside a chimney is called a flue. Chimneys may be found in buildings, steam locomotives and ships. In the United States, the term smokestack (colloquially, stack) is also used when referring to locomotive chimneys or ship chimneys, and the term funnel can also be used.

The height of chimneys plays a role in their ability to transfer flue gases using stack effect, the dispersion of pollutants at higher altitude helps to ease down its influence on surroundings. In the case of chemically aggressive output, the tall chimney allows partial or complete self-neutralization of chemicals in the air before they reach the ground. The dispersion of pollutants over greater area reduces their concentrations in compliance with regulatory limits.

Read more about Chimney:  History, Construction, Chimney Pots, Chimney Draught or Draft, Maintenance and Problems, Dual-use Chimneys, Notable Chimneys

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Famous quotes containing the word chimney:

    With a tale, forsooth, he cometh unto you; with a tale which holdeth children from play, and old men from the chimney corner.
    Sir Philip Sidney (1554–1586)

    Courtship was a serious business for the reason that everybody knew when a young couple began to ‘set up’ with each other. They could tell by the sparks flying from the chimney late at night.
    State of Indiana, U.S. public relief program (1935-1943)

    Down the chimney St. Nicholas came with a bound.
    He was dressed all in fur, from his head to his foot,
    And his clothes were all tarnished with ashes and soot;
    Clement Clarke Moore (1779–1863)