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Modding a Network Switch - Page 4
Written by Rondog   
Thursday, 22 February 2007 11:19
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This mod will be relatively easy because the switch already has holes predrilled along both sides for ventilation. See Exhibit E.



 [ Exhibit E ]

 I popped the lid on the switch to check clearance to make sure the fan would fit, seeing how it was just the mainboard along the bottom of the unit (see Exhibit F) I believed it would. Just to be sure, I put the fan inside, closed the lid, and it shut properly.


 [ Exhibit F ]

I decided to place the fan in the middle of the switch sucking air in and thus pushing it out of the circuit board and out through the ventilation holes in each side.

This part is the most difficult, as it actually requires work as apposed to looking and measuring. Using the fan grill I plotted my 5 holes. Each corner and the middle for the holesaw centre point.

Use plenty of lubrication such as oil for this as it is a fairly dense metal and can heat and damage/break drill bits. When drilling the main hole with the holesaw. I find it easier to drill about half way through, flipping it over and drilling out the other half. This reduces barbs and makes it much easier to clean up. Once the 5 holes are drilled, clean up any rough edges and barbs using a file. It is a matter of screwing the fan into place taking care to make sure the fan is installed the correct way, sucking air in. Remove old fans and cut off both plugs. Now this takes some dodgy wiring. To power an 80mm fan you need both 40mm power connectors hooked to it. (See below). I suggest using longer than necessary wires on the fan as it makes removing the cover much easier later on down the track.


 If possible use a silent fan. It doesn’t need to move much air to it doesn’t matter if you just put a resistor on an old noisy 80mm fan. Finally sit back and admire your handy work.



Abrasions visible on the top of the switch were caused by my negligence during the drilling process. I had the switch sitting on my bench (wood) which scratched the metal surface. A non-slip mat is recommended during this process.

Also, while being almost silent, switch was too noisy for me. So I have added an I/O switch for the fan.



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