1. First, the daily life of "Micro Cooling Fan" is much higher than the background noise in the quiet room, the background noise of 15dBA. General urban, non-residents of communities near transportation corridors, the background noise in the night between 30 ~ 35dBA, while during the day in the 40 ~ 50dBA.
2. Secondly, mute interior wall material has the effect of sound-absorbing, sound insulation, measuring at the inlet side can not reflect the "Micro Cooling Fan" send sound pressure airflow generated, and the actual use of the user can not be avoided.
3. Furthermore, the fan alone to work and installation work on noise heatsink 冸 huge difference. Experienced users know: air-cooled radiator noise, mostly from wind noise and friction sound generated when high-speed airflow through the cooling fins, and "Micro Cooling Fan" itself is only a small part of the work of the noise. Most marked radiator fan noise is only working alone with the noise, rather than the overall noise, the manufacturers did not specify slightly misleading.
4. In addition, the actual use of the distance between the user and the radiator fan is generally less than 1m, if we take into account the effect of noise chassis, small room echo and other effects of the specific situation difficult off. Of course, this is no "standard" measurement can not solve the problem, can only recommend that you do not want to reduce the noise impact damage while maximizing the use of the large distance between the noise source, the choice of sound effects and better chassis, room use of sound-absorbing materials decoration.