Thermalright TL-C12015B 120mm Slim Fan, 15mm Thick, PWM Control, 1800RPM, High Performance Slim Fan

Dateline: A Tiny PC Case, a Space Where Every Millimeter is a Battlefield, 4:07 AM. There is a special kind of madness that drives a man to build a computer inside a box the size of a shoebox. It is a high-stakes game of inches, a brutal, three-dimensional chess match against the unyielding laws of physics. Your greatest enemy in this tiny, hot-box world is heat, and your greatest challenge is finding a fan that can fight it without demanding a space you simply do not have. Standard 25mm fans are bloated, arrogant things in this domain. They are clumsy bulls in a china shop of miniaturized components. You need something specialized. Something lean, mean, and built for the trenches. You need the Thermalright TL-C12015B Slim Fan. This is not just a fan; it is a miracle of engineering. A scant 15 millimeters thick, it is a wafer-thin sliver of high-performance potential. When you hold it, you expect it to be flimsy, a fragile piece of plastic compromise. But it is not. It feels solid, premium, a dense and well-built tool that belies its skeletal profile. But the real shock comes when you power it on. For something this thin, you expect a polite, anemic puff of air. What you get is a hurricane. This slim blade moves a shocking, almost unbelievable amount of air. It’s a testament to some kind of aerodynamic black magic, a full-sized fan’s performance packed into a low-profile chassis. It’s the quiet, powerful engine that makes the impossible, high-performance ITX build a reality. In the cramped, claustrophobic guts of a small form factor case, where a heatsink is fighting for space with a RAM stick and a cable is threatening to choke the life out of your airflow, this fan is your secret weapon. It fits where others cannot. It brings a rush of cool, life-giving air to components that would otherwise be gasping for breath, thermally throttling themselves into a state of pathetic submission. And the value… the value is the final, beautiful punchline. In the boutique world of SFF building, where specialized parts often carry an absurd, "enthusiast" price tag, the Thermalright slim fan is a breath of fresh, affordable air. It delivers top-tier performance and solid build quality for a price that feels like a gift. This is not just a good fan; it is an essential piece of kit for anyone brave or foolish enough to venture into the world of ITX builds. It is the problem solver, the space saver, the silent, powerful engine that keeps your tiny, beautiful creation from melting itself into a puddle of expensive slag. A highly recommended, five-star champion for the small-box warrior.

very nice fan and it is slim and functonal and really quiet too.

I’ve used these on several ITX/SFF builds lately and it’s the best contender for slim 120mm fans in terms of price, performance, and noise. Very quiet on startup. I’ve used them as case fans and CPU fans. I’ve mounted them using screws and clips. Very versatile fan.

If the intake side of the fan is screwed to the case, it will scrape and make a loud hum. I had to create a little space by laying some zip ties to create space between the fan and case to stop the sound. Aside from this MAJOR problem, it works fine and seems to cool very well.

With the price of fans getting outrageous, these are the best. No the are not PWM, but with "Fan Control" software they work really well and are quiet.