Found some more info that might help anyone wanting to use the back cooling fan outlet on the UM2. This is from Daid replying to another post about the power load the back cooling fan outlet is capable of on UM2. Daid "No need to worry about the 5V fan connector, you can safely draw more then 2A out of it."
The answer from Ultimaker support is that the Ulti2 board supports a DC5V fan. However, the DC 12V fan runs just fine and should not damage the board. Good enough for me. Hope this helps anyone interested in mods to the current system. No need to change firmware settings just plug in it and play.
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