... ,15000 square meter factory DC Brushless Cooling Fan(Brushless DC Fan, DC Fan, Brushless Fan,cooling Fan,cooler,Blower Fan) (40x40x10,40x40x15,40x40x20,50x50x10,60x60x15,60x60x20 ... system: B----ball bearing or S----sleeve bearing Operating temperature:-10 to+70Storage temperature:-40 to+70Opreating voltage:rated voltage±15 ...