Adding a Secondary LED fan:

Before you even attempt to add a fan, make sure there is sufficient clearance between the components and the case of the power supply for a fan to fit.

Take a look at the circuit board and find the points where the ground wires and the 12V wires are soldered. There should be spare points for adding more wires. Now I have never done this before, so I am unsure of what will happen. I may toast my power supply and LED fan. So fingers crossed. Now, cutting the wires off the fan at about 4 inches and baring the ends about ½ a cm. This is going to take some skill. A soldering gun would be handy here, but I’ll make do. An improper point soldered that crosses bridges can result in ruining your PSU. Bye bye power supply! Solder the 12V wire (red wire) from the fan to a spare 12V point on the circuit board, and the ground wire (black wire) from the fan to a spare ground point on the circuit board. This has the fan wired up, now to cut a point to fit it.

If you don’t want to do that (I don’t!) take one molex lead, and cut off the plug, thread the wires back through and cut them off at an appropriate length (2 inches) and wire the yellow molex wire to the red fan wire, and one black molex wire to the fan's black wire. Insulate the other black wire and red wire from the molex connector so they do not short out the power supply.

Taking a fan grill the size of your fan, place it on the desired location of the fan, and draw the screw points onto the metal case. Using a ruler, draw a diagonal cross onto the metal PSU case, thus giving the centre point.

Taking a nail punch and a hammer, you can put a small indent in the centre which will give the holesaw something to start on and prevent the drill from sliding everywhere.

Using a holesaw, you can easily and quickly cut out the circular hole for the fan. File off any rough edges. Next drill out the screw mounts for the fan using a 3/16 inch drill bit. Screw the fan and grill into place. Put the PSU back together. Fire it up by jumpering the green and adjacent black wire on the ATX power connector together.

There are no photos of this mod, for which I apologise, but at the time of writing, I did not have access to a holesaw kit.