Just a slight warning
by Gary
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Even though these fans do a pretty good job, and very handy if space is an issue. Be warned even though they are 140mm fans, it's more of an octagonal shape frame, therefor the screw holes are not in the standard place as a standard 140mm square framed fan. They will no fit a 140 /280/ 420mm radiator as the screw holes are not in the same place as a standard fan. Other than that they work very well.
Excellent Fan
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I'm surprised there aren't more 15mm fans out there, as saving 1cm of space inside a case really is extremely important, as it means an extra 1cm of height on a CPU heat-sink, or just an extra 1cm of space for cabling and air to flow through inside your case.In spite of its 15mm thickness, this fan performs roughly on par with similar 25mm thick, 120mm fans, however saving that space is a huge boon in my experience. As a fan it has good airflow at 1000rpm, and can also run very quietly at 500rpm, with only the slightest mechanical noise (muffled by most cases). It's a PWM fan though, so keep in mind that most fan controllers won't work with it unless you're okay with it running at full speed all the time.Personally I'm now tempted to use these fans in practically every build from now in, but in particular any that have space constraints such as compact Mini ITX systems. But you can use these just as easily for a double fan CPU cooler you couldn't otherwise fit due to height or motherboard clearance, or in awkward spaces in a case where a fan might not normally fit.The only downside is that they're a tad pricey, but in my opinion they're worth it, and I'm not sure if I can use any other fan again!