1. Temperature rise: In "Cooling Fan Manufacturer" a system that is inversely proportional to the amount of air required for cooling temperature and allowed. Allowable temperature rise slightly increased, to a significant reduction in the required amount of wind. Therefore, if allowed to impose the limit temperature rise slightly relax, will reduce the required amount of wind noise can be reduced.
2. Vibration: "Cooling Fan Manufacturer" that some cases of very light weight of the entire system, or the system must operate in accordance with the provisions when some particularly soft isolated equipment recommended in order to avoid passing the fan vibration.
3. Voltage: changes in the voltage variation will affect the noise level. The higher the voltage applied to the fan, because the speed increases, the greater the vibration, noise generated is also greater.
4. Design considerations: "Cooling Fan Manufacturer" said every part design constitutes the fan, will affect the noise level.