Hi. No one else has jumped in so you got me, a novice, how ever I have set up a fan as you are asking. First thing to establish is what printer you got? This helps guys help you.
I have a FFC PRO so my info is based on this. This board is 24 volts so to come off this board you need a 24 volt fan. Not the one you asked about.
There are a number of 24 v outlets off the transformer?? Power box??Look CAREFULLY you will see they are marked. This set up will require a switch. There is a place on the board next to the case fan connecter for additive cooling on the FFC PRO. I slice with Simplify3d that has a setting to stop start fan as required.....If you really really must have the 12 volt then you will require a voltage stepper 24 down to 12, this will have to come of the power box. Heat sink paste will be needed.I have done this to cool 2 of my stepper motors. You will be wise to ask at your electricial store the set up.
With thanks......