... efficient 2.low noise 3.low voltage 4.ISO9001-2008 Low-noise axial fans1.GeneralMarine low noise axial fans ... have the features of high efficiency, low noise,stable turning etc.They are suitable for ... Therefore,they have the features of high efficiency,low noise,large flow & pressure coefficient, light weight etc. ... (m3/h)Total pressure(Pa)Speed(r/min)Noise Db(A)Power(Kw)FrequencyWeight(kg)HSCDZ-25 ...