... track of the blade axis.Standard DC Axial fan sizes include 20mm,30mm,40mm,50mm,60mm,70mm,80mm,92mm,120mm,150mm,200mm. 2 ... DC Fan China OEM,Transparent color Blower Fan Brushless DC fans and inductive DC Fan,DC Fan Cooler,AC fans,Cooling fan,Axial Fans,Brushless FAN,Blowers Fan,humidifier Fans,Purifier Fan ...