"Inflatable Air Blower" The higher the speed, the greater the noise. If the non-prolonged abnormal noise, then that in itself is not a problem. The reason that the fan noise after another, from the thermostat "Inflatable Air Blower". When the CPU tasking frequently, the temperature will gradually, will take the initiative to enhance the speed, and thus play a cooling effect. If you issue a whirring sound long, most likely from dust or friction between the shaft with bearings, it is recommended on a regular basis "Inflatable Air Blower" to remove dust or grease-related after-sales maintenance.