What do the black spinning things on the top of vans do?

Question

It has bugged me for ages, my boyfriend thinks ventilation but I'm not so sure.

Answer 1

ventilation =]

Answer 2

Air vents...these circulate air into the back o the van

Answer 3

Yes its ventilation.

As you drive along the air going past it makes it spin and this draws up the air.

Answer 4

simple is as simple as

ventilation...

Answer 5

Alien mind control modules. Try not to make eye contact with them.

Answer 6

The black things spinning on top of vans are contestants on Americas Got Talent.

Answer 7

And your boyfriend is correct. My mate is a police dog handler and the alsatian needs some air when travelling.

Answer 8

Air con.

Answer 9

You should believe your boy friend, he is right, now tell him you are sorry and take him to dinner.

Answer 10

Yes it's ventilation - see http://convertavanltd.co.uk/services/van... for instance. But I wouldn't tell your boyfriend that. Why should he be right?

Tell him you have it on good authority that it's a device to make sure vans and high-sided vehicles don't blow over in high winds, and that it works by equalising air pressure.

Answer 11

i dunno....Spin? Just for the sake of it and to look good?

Answer 12

the b/f is right

Answer 13

You should always listen to your b/f, men are always correct.

Answer 14

'fraid i have to agree with quite a few previous answers. They are indeed for ventilation, and yes you should trust men about mechanical things, just like men should trust women about dress sense. I think its a genetic thing!