... ball bearings,IP54 or IP44,S1 operation 3.sheet steel,thermal protector,UL,CE 2. Brief Introduction of Axial fan ... 500 mm—Material: Guard Grille: steel, phosphated and coated in black plasticWall ring: sheet steel, re-galvanised and coated in ... - free ball bearings—Motor protection:Design with thermal overload protector—Cable exit: variable—Protection class:I3. performance parameters MODELVOLTAGE ...