any technology sufficiently advanced as to be indistinguishable from magic must be magic...Therefore I am a techno-mage...Behold my power and shudder in fear!!!!
Muahahahahaha
Muahahahahaha

Thanks! That now puts me about 10% of the way to understanding how the hell it works.The only reason I know this is because I'm a fan of Craig Ferguson and he had Mr. Dyson on his show. (Craig loves the vacuum "with the proper amount of suction.") Dyson said that the fan works on a version of Bernoulli's Principle. (Which Craig was familiar with being a pilot.)
I'm not sure I understand what this has to do with the Bernoulli principle and I'm also a pilot.
But after doing a bit of research, this makes sense:
1 Dirty washroom air is sucked in by the Dyson digital motor.
2 It passes through a HEPA filter, removing over 99.9% of the bacteria from the air used to dry your hands.
3 The clean air passes over the electronics, cooling them.
4 The air then reaches the motor, which channels it up and through the machine.
5 Air passes into the air ducts, which are insulated to reduce noise.
6 It’s then forced through two apertures – creating sheets of air traveling at 400mph, which literally scrape water from hands.
ETA: and now that I know it uses a HEPA filter, I am slightly happier to use it.