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Those "things" u see on van roofs. There usualy black and spin around,i was once told there some type of aircon is that right? Curiosity's got the better of me!
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they are roof vents made by a company called Flettner, They work by drawing air out of the van when it goes round. I had one in my last van for the dogs but I dont think it made much of a difference to be honest.
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Originally Posted by RSCAT
got one on my van, ventilation, lets chemical gasses escape on up to the ozone layer ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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