1.YWF500,380/230/120V,50/60Hz,900/1350rpm 2.ball bearings,IP54 or IP44,S1 operation 3.sheet steel,thermal protector,UL,CE 2. Brief Introduction of Axial fan with external rotor motor YWF500—The diameter of the fan blade:500 mm—Material: Guard Grille: steel, phosphated and coated in black plasticWall ring: sheet steel, re-galvanised and coated in black plasticblades: sheet steelRotor: coated in ...