What Are The Spinning Discs On The Roofs Of Vans?

Mystery Hour

Mystery Hour Question

On the roof of some vans, you get black spinning discs. What are they?
Darren, Walton-on-Thames

Answer

** Definitive **
Name: James, Westminster
Qualification: We drive guard dogs around
Answer: They are called “fletner vents” on vans and are used when you are transferring dogs or food. As there are no windows in vans, there needs to be another way to circulate fresh air – and also get rid of the smell.

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