Veton DC Brushless Fans have the protected of reverse polarity.It have various of sizes ranging from 25*25*06mm to 172*150*51mm.It have the sleeving bearing and ball bearing.It has the operation voltage of 5V,12V,24V and 48V.Special voltage could be customized.In order to meet the worldwide safety requirement.It have obtained the certificates of UL,CUL,TUV,CE,SGS and REACH. Veton DC Brushless Fans ...