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.
Given that the fan’s speed exceeds 40 dBA (40.8 dBA), you will wonder why the 30 dBA normalized noise output charts are missing. I couldn’t get it close to that noise level. At 100%, the fan output is 40.8 dBA, and at 99%, it is 38.3 dBA. This is why, in frequency analysis, I included both 99% and 100% speed levels.
20 dBA Noise Output
- Average speed
- Low airflow
- Top static pressure
- Increased power consumption
25 dBA Noise Output
- Average speed
- Low airflow
- Top static pressure
- Average power consumption
30 dBA Noise Output
- Low speed
- Low airflow
- Top static pressure
- Low power consumption
35 dBA Noise Output
- Average speed
- Low airflow
- Top static pressure
- Low power consumption
