Revoltec AirGuard 120mm (RL039)
This fan is manufactured in China. Besides it, the box contains only a few mounting screws. The recommended price is $9. The warranty period is 1 year.
The fan has a black 9-blade impeller and a black frame.
The impeller is 112 millimeters in diameter. The fan spokes are all curved clockwise, opposite the direction of the impeller’s rotation. Three of the spokes are 4 millimeters wide; the cable spoke is 10 millimeters. The rotor is 40 millimeters in diameter. The weight of the fan is not specified, but it isn’t heavy subjectively.
The blades are small but have a large angle of attack. They get wider from the base towards the thick ends.
Two ribs at the input and output of the air can be seen on the interior of the frame. The Revoltec AirGuard 120mm (RL039) is specified to have a rotation speed of 1200 RPM, an air flow of 51.5 CFM and a noise level of 23.9 dBA. The static pressure of this fan is not specified.
A mysterious type of bearing, Hysint bearing, is indicated on the fan’s sticker.
The manufacturer’s website doesn’t say anything about that but I suspect the Revoltec AirGuard is equipped with a fluid dynamic bearing. Its rated service life is 50,000 hours. The fan has a start-up voltage of 5.5 volts as opposed to the specified 7 volts. Its power consumption proved to be 1.63 watts in my tests although its specifications say 2.16 watts.
Here are the test results of this fan:
It is hard to be fair to other fans after the Noiseblocker NB-BlackSilent PRO PL-1 and PL-2, yet I will do my best to be objective. The Revoltec AirGuard is not noisy or rattling, though. It is comfortable up to 1050 RPM and quiet up to 890 RPM. Its airflow results are rather average compared to the other tested fans.