... of frame,wind set,fan blade,motor,drive mechanism,bracing frame,shutter,protective net etc. the motor drives the fan blade,air flow ... control of steel spring, which prevents any air leak, the motor is seted in the top of the fan, which is ... pressure (Pa)Noise (DB)Input power (KW)Rated voltage (V)Motor speed (r/min)SizeL×W×T(mm)9FJ-7171056029555≤700 ...