I don't believe that the conductivity of freshwater would conduct any
current at only a 5Vdc potential. Wiring 2 fans in series would divide
the battery's 12Vdc potential into a more practical 6Vdc working voltage.
The fan's are not designed to operate (turn the blades) at the viscosity
of water, so they would be prone to overheating, but submerged in water,
they could not really overheat, could they? ;~)

I'm not suggesting that anyone try this. It's only an idea with some
potential. It would need to be tested with the correct equipment.
NetMax

"Anton" wrote in message
.rogers.com...
I believe CPU fans run on 5V, but I would be surprised if it didn't
short
out when you drop it in the water. Even submerging the bottom third of
the
fan would likely create enough splash to short out eventually.

I like the idea though!

-Anton

"NetMax" wrote in message
...

I wonder what a CPU fan would do underwater? (after adding a mesh so
you
don't decapitate any fish). They are probably not 12Vdc, but they
would
be low wattage...hmmm.

NetMax