Venturi fans have some of the softest mounting corners. The transmission of vibrations from moving parts further away to anything (case plates, heatsink fins, …) is thus very significantly damped. Compared to other (even more modern Fractal Design models), these fans have more robust blades, which are both thicker and wider, and as a result, higher static pressure is also achieved at comparable speeds.
Reality vs. specifications
Explanatory note: For a quick overview of how manufacturers “spice up” specifications, we have a sort of “truthfulness” coefficient. We calculate this by putting our measured values in proportion to those given in the specifications by the fan manufacturers. A result of “1.00” means that the claimed parameters match the values we have recorded. After such a finding, we can conclude that the manufacturer has done his job honestly and the way he presents the fan agrees. The more the coefficient number is different from 1.00, the less accurate the claimed specifications are. Of course, the better case for the user is if the coefficient is higher than 1.00 (and it is, for example, 1.20), then the real parameters exceed the paper ones. Conversely, if the coefficient starts with zero, then the fan does not reach the parameters on paper. For example, a value of 0.80 means that the real airflow or static pressure is 20 % lower than the manufacturer claims. If a value is missing from the chart, it is because the fan manufacturer does not specify the airflow or static pressure.
I wonder the reason why these type of corners, despite being so effective, are uncommon. Is it a lack of necessity due to inherent low vibrations, rubber pads/mounts being good enough/better, or some kind of cost or mechanical concerns?
It’s hard to say anything for sure. But I will dare to speculate.
Let’s assume that higher vibrations characterize mainly the cheaper fans, where the goal was to make them as cheap as possible. All-rubber corners don’t fit into this scheme (lowest cost) (such Arctic P12 don’t even have rubber pads), so they are usually not used. And again, when there is a bigger budget for fans, the funds can be put into things that suppress vibrations more effectively than perfect anti-vibration corners. Whether it’s a stiffer material (just with a larger thickness or a different composition, for example LCP instead of PBT) or a less vibrating motor etc.