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:

    The chimney is to some extent an independent structure, standing on the ground, and rising through the house to the heavens; even after the house is burned it still stands sometimes, and its importance and independence are apparent.
    Henry David Thoreau (1817–1862)

    Now he sings of Jacky Horner,
    Sitting in the chimney corner,
    Eating of a Christmas pie,
    Putting in his thumb, O fie!
    Putting in, O fie! his thumb,
    Pulling out, O strange, a plum.
    Henry Carey (1693?–1743)

    I change, and so do women too;
    But I reflect—which women seldom do.
    Tobacco is a filthy weed,
    That from the devil doth proceed;
    That drains your purse, that burns your clothes,
    That makes a chimney of your nose.
    —Anonymous. “Written on a Looking Glass,” from Geoffrey Grigson’s Faber Book of Epigrams and Epitaphs, Faber & Faber (1977)