... Low noise 4, Long life time DC Brushless industrial fan 310mmCharacteristic Material:Impeller completely made of sheet aluminumTechnical features: ... blowers2.Automobile fans/blowers, such as bus fan and blowers, small car fan, refrigeration cars 3.Household appliances fans/blowers, ... and refrigerated cases fans/blowers6.Other usagesFan tests(every fan must go through 52 kinds of tests before delivery) ...