... Roof ventilating fan,Dia.300mm~1120mm. Volume:3300~53000m3/h, Pressure:62Pa~350Pa, Power:0.37kw~5.5kw, Voltage:380V/440V contentRoof ventilating fan,axial fan ... :Dia.300mm~1120mm.Volume:3300~53000m3/h,Pressure:62Pa~350Pa,Power:0.37kw~5.5kw,Voltage:380V/440V/OtherCentrifugal Fan ... ordinary roof WT4-85-11 series ... 8 Roof ventilating fan