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Default Why do spinning van roof vents work better?

Why are these fitted instead of just a stationary vent like you see on caravans?

http://www.flettner.co.uk/van-roof-vents/

I don't see the point in using the wind to power a vent, when the air was already moving. Surely that's like fitting a generator to your bicycle to power a motor to make you go faster?
 
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