The water-tightness comes primarily from the fact that the fan operates magnetically. There are no electronics exposed due to the magnetic bearing mechanism.
I doubt it's water-tight. The magnetic bearing would work with any reasonably clean fluid in it. The electronics are made of hermetically-sealed components and tap water is a poor conductor so it wouldn't short out the circuits. Finally, the motor drive is sufficiently robust to handle the additional load from moving a higher viscosity fluid.
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That way, if my 3rd floor apartment ever gets flooded, at least I won't have to worry about the fans in the computer!
I hate you.
I hope the synchronicity is not lost on some.
If I was doing the test you'd probably hear a bunch of laughter and a O shite! it's working lol...
And I'm sure water would still be a factor on the magnets in some corrosive way or something.
What are you using to tape this video by the way? That is REALLY sharp.
Canon 5D Mark II with, in this instance, the 50mm f/1.4 lens.
Pretty awesome, though. Thanks for resurrecting it, Prime; reminds me I should dive into the archives sometime.
Also love these fans. I used them all over my mini-monster watercooling project in the NZXT Rogue; they were brilliant.