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I have spotted this on the rooftops of industries, workshops, etc. I guess this is used for providing ventilation. This is not electrically powered. But then how does this work??

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  • $\begingroup$ That is a wind-driven ventilator. $\endgroup$
    – Kyle Kanos
    Sep 30, 2013 at 19:22
  • $\begingroup$ @KyleKanos- A friend of mine argues that, its the exhaust of warm air from under the roof that makes the ventilator rotate and further assists in the process..I cant counter his point $\endgroup$ Sep 30, 2013 at 19:31
  • $\begingroup$ I am pretty sure that it is the wind on the outside that is driving it. $\endgroup$
    – Kyle Kanos
    Sep 30, 2013 at 20:06
  • $\begingroup$ I have recently seen lots of them on sale in an open-air store and with a light breeze they do spin fast. $\endgroup$
    – Peltio
    Jun 15, 2015 at 9:58

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I am familiar with such equipment. There are several kinds and are wind-driven. There is a paper A review on wind driven ventilation techniques about passive ventilation techniques.

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