Heko centrifugal blower fan series is with single inlet and double inlet scroll housing. Both of single inlet and double inlet centrifugal blower fans are with AC and DC input. 

Size of DC single inlet centrifugal blower fan: 97mm,108mm, 120mm, 133mm, 140mm, 160mm and 180mm. Size of AC input single inlet blower fan: 108mm, 120mm, 133mm,140mm 160mm and 180mm. 

Size of both DC and AC input double inlet centrifugal blower fan: 133mm and 146mm. 

All size centrifugal blower fans are motorized by 3-core ec brushless external rotor motor.