AC backward centrifugal fan 310mm 355mm 400mm Backward centrifugal fan 355mm Features: 1) 4 poles 2) Speed: 1,400rpm 3) Impeller diameter: 355mm 4) Airflow: 2,250cbm/h 5) Power: 180W 6) Voltage / frequency: 230V/50Hz 7) Current: 0.83A 8) Insulation class: F 9) Used for ventilation and cooling, with external rotor and metal or plastic backward curved blades