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Posted to uk.d-i-y,alt.home.repair,alt.sci.physics
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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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