Noctua's next generation A-series fan due out this fall has, according to PC gamer, had a whole lot of engineering work go into it. We're talking 200+ prototypes, and four and a half years of development to come up with a fan that produces low noise, but also moves a lot of air, even when up against radiators and coolers, or in other applications that require a good amount of pressure. They accomplish this using a combination of new materials, and very tight tolerancing. Another interesting aspect of their claims are regarding whether it is a high airflow or a high static pressure fan. They claim it is neither, and explain that really, you don't want either of those. The standard measurement techniques for airflow and for static pressure involve airflow with no pressure at all, and pressure with no airflow at all, neither of which are particularly useful in the real world. What is more interesting is the kind of numbers the fan puts out with realistic pressure, and that's where Noctua claims this new A-series fan design is a real winner. I found this discussion on fan design elements and performance measures rather interesting. I've been a huge fan of Noctua's fans over the years, and currently have nine of their 2000rpm Industrial PPC PWM fans in my main build. I commend them on not going the easy route and just throwing tons of RGB and "gaming design" all over their products, but instead trying to advance the performance of their fans, and look forward to giving them a try when the 140mm versions come out. That being said, they are still tan and brown, which is a bit of a bummer. Dellinger says the 120 mm model will even outperform most 140 mm fans on the market when it's released this fall, and Noctua plans to release an adapter mount for 140 mm fittings. Which is good news, since a 140 mm model likely won't be available for at least a year. Apparently that's not as simple a matter as making everything 20 mm bigger; Noctua has to redesign the fan blade for a larger body.