Fan frame: made from highly galvanised steel sheets in order to assure highest strength and strong resistance to corrosion.Blade: 6 pieces stainless steel blades and the fan has all passed the experiment of homeostasis with big air volume,without deformation ,no breaking attractive and durable.Belt pulley:the V type belt pulley is aluminium magnesium alloy injection moulded,light weight ,high-strength.Bearing :France imported bearing,high intensity ,low noise .long service life.技术参数model Diameter blades(mm) Air volume power Outer size(mm) voltage frenquencyXLXS-1000 1000 35000 m3/h 0.75KW 1100*1100*400 380V 50HZXLXS-1250 1250 42000 m3/h 1.1KW 1380*1380*400 380V 50HZXLXS-1400 1400 55800m3/h 1.5KW 1536*1536*400 380V 50HZ/p>