But what if you already have an 80mm heatsink? How does putting a 120mm fan on it sound? This is also a very easy mod, although it will need a hole cutting in the side of your case to allow the 120 fan to breathe properly, and may well need a hole making to fit at all. I am sure many of you will agree this is a small price to pay for getting 100+ CFM through your heatsink. The couple of quid I paid for this 3 litre bottle of rotgut cider isn’t much either.

Yes, it’s exactly the right size. As far as I know, all 3 litre plastic bottles are about 120mm in diameter, but this cider bottle has a much less curved neck compared with coke bottles, which should make a smoother duct. I am using another 80mm fan frame for the 80mm end. First I file it smooth, and take off the flats on the sides. Then I just epoxy it on, and file down the uneven edge.

Here is the finished duct, you could add a bracket for mounting the 120mm fan, but since this is only a proof of concept prototype, I shall use tape instead. This article will be updated with some performance figures when I can lay hands on a suitable heatsink and 120mm fan for it. I am sure u can imagine the kind of performance this would give with a 120CFM ystech fan and a copper heatsink.

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