Cooling an Enclosed Computer Desk - Ikea Alex

First step was to source all the parts:
Electrical components
 - 3 Pin fan extension cables 24" http://www.amazon.com/gp/product/B001DI65AM/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
- 3 Pin external back plate adapter - http://www.amazon.com/gp/product/B003KQ3RSS/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
- 2 120mm Fans ( i went with these becuase they move more air than the cheaper ones)
http://www.amazon.com/gp/product/B0026ZPFDE/ref=oh_details_o02_s00_i01?ie=UTF8&psc=1
- 2 120mm grill covers http://www.amazon.com/gp/product/B0036WTDHK/ref=oh_details_o02_s00_i05?ie=UTF8&psc=1

Total  - $27.50

Hardware:
8 bolts (50mm/2"), 8 washers, 8 lock washers, 8 rubber washers, 8 nuts  - #8 or #10 (US) M4 or M5 (metric)
I used black to match the grills, and Allen heads because i like the look.

Total - $9.00

Fan Location:
I read in one of the articles that the best places to put the fans would be at the bottom at the front of the cabinet and the top on the back of the cabinet. Meaning the air would enter at the bottom and be expelled at the top.  This was the same in my computer case.  If your computer has a different set up maybe you could rearrange the fans.

Make sure that your fan locations are not going to interfere with any structural pieces in your cabinet (the 'cams' in the Alex cabinet).  The location doesn't have to be exact.

Cutting Fan Holes

Once i determined roughly where my fans were going to be, i covered the area on the inside and outside with painters tape, you could use masking tape.  This was so i could draw where to cut and to prevent too much splintering of the laminate surface.

I used the grill to help measure out what needed to be cut, it was the same size as the fan.  However i didnt just simply draw around the grill.  The grill itself was 120mm (4 3/4") square.  I reduced the size of the hole to 115mm (4 1/2") so that the grill covered the edges of the hole.

I used a square to make sure all of the lines were square.

I then ran into the issue of where to screw through if i cut a square hole.  I decided to leave the corners of each intact so i could later drill a hole for the bolts.

I just measure down 25mm (1') on each of the corners and just joined up the lines.

I then cut out the two holes using a jigsaw. The corners were a little tricky, but if you take your time.  I drilled a hole to get the jigsaw started.

I then used the grill  and the square to mark out the holes for the bolt.  Making sure that all of the cut lines were covered.  I used a bradawl to make sure that the hole would be where i wanted them and didn't slip in the surface when drilling.

3 Pin back plate adapter.

I didn't know such a thing existed until i started researching this project.  It was super easy to install, just found an unused Molex connector from my power supply and plugged it right in.

I used the extension wires because the wires attached to the fan would not be long enough to allow me to move the PC in and out of the cabinet if needed.  Some fans have much longer wires. You can also get various lengths of extension.

Securing the fans to the cabinet.

The bolts would need to be a minimum of 50mm (2")  and i wouldn't go any longer than 65mm (2.5") so they don't get in the way.

I used a washer on the outside of the grill so i didn't crack it when tightening.

The rubber washer was to try and reduce vibration/noise from the fan.  Placed in between the fan and the cabinet.

The lock washer was to stop the nut from vibrating loose.  You could also use a nylock nut.

WHEN CONNECTING THE FANS MAKE SURE THEY ARE ORIENTATED THE RIGHT WAY - Bottom one blowing in, and the top one blowing out.  I found that out the hard way.  

It's a bit of a stretch tightening up all of the bolts on your own, you may need a helper.

Connect everything together, hopefully everything still works and your cooling issues have been solved.  Mine were.

Phil