Normalized Noise Tests
For these tests, I set the fan to speeds with noise output at the following predefined levels: 20/25/30/35/40/45 dBA. I skip the corresponding tests if the fan under the test cannot reach some noise levels. The speeds shown in the graph below are measured with the fan in a clear space inside my hemi-anechoic chamber without any obstacles. I set these speeds on the Longwin machine, but they slightly change because of the variable conditions that the device applies.
Lately, we discovered a peculiarity of the Longwin apparatus, so we are re-testing every fan we have, and we will continue to double-check all results because it seems the Longwin’s fan controller doesn’t “like” speed control for these tests, but it works better with PWM control. This is why you will find differences with results listed in previous reviews; we constantly update the noise-normalized tests to make them as accurate as possible!
20 dBA Noise Output
Fan speed is low, a sign of an ineffective design. CFM performance is low, and static pressure is dead low.
25 dBA Noise Output
Fan speed remains low, CFM performance is low, and static pressure is dead low.
30 dBA Noise Output
Again, low fan speed, low CFM, and dead low static pressure. The only good thing in these tests is the low power consumption of the fan, but on the other hand, this is expected given the low-performance readings.
