... fans with external rotor are able to work with condensing and evaporating units with 4 to 16 fins per inch on the ... .B or CL.F3.Life at 25C: 50000hours4.Blade dia: 200,250,300,350,400,450,500,550,600,630,710 ... CCW7.Operating temperature from : -30~60C8.Blades angle can be set to 35 degrees9.Bearing system: Ball bearing Axial fan with frame