Roof blower fan,Dia.300mm~1120mm. Volume:3300~53000m3/h ... 0.37kw~5.5kw, Voltage:380V/440V/others contentRoof blower fan,axial fan:Dia.300mm~1120mm.Volume:3300~53000m3/ ... and less than 85 DbA noise indicators. Low noise centrifugal fan DW3 roof-88-11, DW4-75-11 series ... degrees, 55 DbA small noise indicators. Ex low noise centrifugal fan BDW3 roof-88-11, DW4-75-11 Series ... -6YDW0.75(0.8)-60.8 Roof blower fan