there is one called the Crossflow (X-Flow) i think coolermaster makes it. it does that your diagram says. they use them to cool the shuttle mini computers.
here it is, but it appears to suck air in from one side only:
http://www.overclock.co.uk/customer/...oductid=17824#
i have seen one somewhere where the motor is in the middle and air is sucked in from both sides. ( i think the shuttle version of it has the motor in the middle)