... period: one year for quality problems5.Strict quality control, three testing procedures:Voltage test,Fan test,and function test.6 ... separately or at the same time2.Excellent effective 16MM motor , low noise, strong wind3Humidifier: moisturizes the air,useful in winter & ... :1h,2h,& 3h4.Wind Type: Natural, Normal, Sleeping5.Three wind speed : Low-Medium-High6.Wind Direction: Fixed,Oscillating 7.Six meters ...