quality posts: 5
I just love the explanation of how this works on HowStuffWorks dot com. I quote: "While the tube doesn't have any blades inside it, the pedestal of the fan contains a brushless electric motor that takes in air and feeds it into the circular tube."
Or, in other words, there's a fan in the base. Attached to the motor.
Onomatopoeia. Get used to it.