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!

 

Don't know what they're called but they are for ventilation......RSPCA vans have them.

 

i thought it was something to do with static

 

i have always wanted to know this.

 

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.

Graham

 

got one on my van, ventilation, lets chemical gasses escape on up to the ozone layer

 

They are just vents though

 

Same here, used to have one on the roof of my van when i worked in pest control, you could smell the chemicals when you walked past it