Detailed Product Description Axial fan, YHWF-4010, has a close linear relationship between voltage and adjustable speed, ... ModelRated VoltageOperation VoltageRated CurrentRated SpeedAir SpeedStatic PressureNoiseBering(V)(V)(A)(RPM)(CFM)(mmH2O)(dBA)SystemYHWF-4010L1210.213.80. ... the customers differents requirements about electrical parameters( for example, the noise,airflow,speed,the current,etc)