... 325 184/303/383Characteristics of WUSUN Greenhouse Ventilation Equipment:Exhaust Fan -Huge air volume, Low noise, Good energy saving, ... - Wall or window mounted. -Blade Pulley of Light weight, High intensity, Quick assemble, Anti-corrision - Motor of 380/220V, ... by natural physical phenomenon----evaporation. the combination of exhaust fan and evaporative cooling pad can sustain the factory temperature ...