Chimneys

Some wind chimneys rotate and some do not

Have you ever taken a walk outside and wondered why some chimneys have spiral fins, or wings, near the top? The answer has to do with wind, but maybe not in the way one might think. When air meets a uniform cylindrical object, it may form oscillating vortices behind the object. It. . Is it normal for Class A chimneys to sway in the wind? Active since 1995, Hearth. com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment. We strive to provide opinions, articles, discussions and history related to Hearth. . Ever since we moved in (2 1/2 years ago, new construction), when it is windy, we can hear a rattling inside the chimney. it can get pretty loud at times, like something is knocking against the metal flue. Despite the fact that wind flowing over a chimney can produce a driving pressure, it cannot be depended upon for appliance. . 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. I came up with two possibilities: The wind circles around the chimney upwards which pushes whatever gases being released even higher into the sky.

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