I came across this wonder of technique when killing some time in Harvey Norman and was wondering what is it and how does it work?
I found out it’s a fan from Dyson – yes those guys who make also this fancy vacuum cleaners. The fan actually has no blades what makes this fan pretty safe and easy to clean. To make this fan work air is accelerated with an mixed flow impeller (like a turbocharger) through the annular aperture and over a ramp generating an uninterrupted stream of smooth air.
Still no idea how it works? Watch this:
Downside of this designer masterpiece is that you have to pay $399 for it – what is quiet expensive for a fan in my eyes.
However if you want to get rid of your cheap, old and ugly looking fan get the new, expensive and good looking dyson air multiplier.