Before the serrated blade leading edge made it into the production version of Fluctus, it went through several years of testing — successive geometry variants, measurements on test benches, and checks on how changes in the angle or depth of the notches affected both airflow and how the sound was perceived by the human ear. These are two parameters that usually work against each other: it's easy to improve one at the expense of the other, but much harder to find a compromise that holds up under measurement.
This is exactly the problem our R&D team spent years analyzing — in Sokołów, near Warsaw, Poland. The result of this research, prototyping, and experimentation is the technology now used in Fluctus fans. Its innovative nature has just been confirmed by the European Patent Office: on May 13, 2026, we officially received patent EP4314569 for the invention "Axial fan with serrated blade leading edges." This means the solution described in the patent documentation is now covered by European legal protection. The characteristic blade geometry is therefore not just a design feature, but part of a protected technical solution.
"The European patent is the culmination of many years of teamwork: hundreds of tests, successive prototypes, and a constant search for better solutions. It was made possible by the trust and commitment of the entire team at every stage of the project. We see this document not just as recognition for what we've already achieved, but also as a starting point for further developing and expanding the use of the technology we've created — one we can now effectively protect."
— Piotr Pietras, Chief Product Officer Components, ENDORFY
A Sound You Can't Ignore
Anyone who has spent several hours at a heavily loaded computer knows the feeling. Temperatures stay within range, the fans follow their curve exactly, and yet after a while a steady tone starts to wear you down.
It doesn't have to be loud. It just draws attention to itself.
A standard noise measurement describes sound pressure level. It's a necessary metric, but it doesn't capture the full user experience. The ear and brain don't perceive every frequency equally. Two sounds with a similar meter reading can feel very different in how annoying they are. That's the focus of psychoacoustics: the study of how people actually perceive sound. What matters isn't just loudness, but also spectrum, tonality, variability, and whether a noise blends easily into the background or stands out from it.
That's why our team's goal wasn't simply to lower a number on a spec sheet. It was to shape the sound of the fan so that during gaming, work, and long sessions, it would be less "noticeable."
How Do the Fluctus Fan's Serrations Work?
Spinning fan blades generate air vortices — and these, in turn, produce distinct, repeating tones at specific frequencies. It's these sharp, single tones (not decibel level on its own) that make some fans feel like they "drill into your head," even at relatively low RPM.
The solution we developed together with the Synergy Cooling team is a special serrated geometry along the blade's leading edge. Instead of a smooth edge, the air meets a series of small, repeating notches. These notches break up the forming vortices so they don't generate a sharp, bothersome tone. The result is a more even, broadband noise that the human ear perceives as softer and less noticeable.
A chart comparing Fluctus to a conventional design shows fewer pronounced peaks across the sound spectrum. This reflects a real change in how the fan sounds in operation: a reduction in the tones that draw the most attention. That kind of sound blends into the background more easily and is less disruptive during long computer use.
A decibel figure alone doesn't describe the full character of a sound. Two fans with a similar sound pressure level can be perceived very differently — Fluctus comes across as quieter, because it doesn't call attention to itself and is easier to tune out.
What You Gain at Your Desk
Above all, comfort — during both work and play, especially in longer sessions.
While gaming, the fan cools your components without adding an easily recognizable, steady tone to the background. When rendering, compiling, or exporting video, computer noise becomes less tiring. In a quiet room, its hum more easily fades into the background.
This matters most where the fan has to work against resistance: on a dense radiator, a liquid-cooling radiator, behind a dust filter, or in a case with more restricted airflow. Fluctus was designed exactly for these demanding conditions. Its construction is built to deliver the high airflow and static pressure needed to push air through restrictive components. The serrated blades aren't a way to improve acoustics at the expense of cooling — their purpose is to combine efficient airflow with better acoustic comfort.
The Fluctus Fan Is More Than Just Blade Shape
The European patent confirms that this characteristic geometry is neither a stylistic touch nor just a marketing name — and that years of hard work by our R&D team amounted to something real. The patent simply formalizes that result and lays the groundwork for further developing our own know-how.
Of course, more than just the patented blade technology stands behind Fluctus's success. It's clearly the fan's most important distinguishing feature, but without carefully refined details throughout the rest of the design, results like these wouldn't have been possible.
The frame is designed to reduce unwanted turbulence. Integrated anti-vibration elements cut down on vibration transfer to the case or radiator, and a durable FDB bearing ensures years of quiet operation. PWM control lets you match fan speed to system temperature, and the fan-stop feature allows the fan to stop completely when the control signal drops low enough. All of this comes backed by a six-year warranty.
Fluctus fans have earned international recognition, reflected in positive reviews, awards, and independent Cybenetics certifications. The Fluctus 120 PWM received an Airflow Titanium and Static Pressure Gold rating, while the 140mm version earned Airflow Platinum and Static Pressure Gold. These certifications confirm that the design maintains high airflow efficiency and static pressure.
The patent and independent certifications are the best proof that the work put into this blade's shape translates into a real, measurable benefit — both in performance and in acoustics.
