I modeled a fan and try to use flow simulation so i followed the solidworks 2012 flow simulation tutorials

then i try to calculate the efficiency but the result is more than a 100% i attached the value i obtained and the fan picture.

the efficiency formula that i use is :

Pressure drop = (Av inlet Static Pressure)-(Bulk Av Static Pressure)

Efficiency =  (Pressure Drop)*(Inlet Volume Flow)/(Torque on Impeller)

Is my formula is wrong?

Thanks in advanced.