Our axial fans can reach below standard: 1. Protection class: IP54 or IP55 2. Insulation class B,F,H 3. Life: 50000hou Our axial fans with external rotor are able to work with condensing and evaporating units with 4 to 16 fins per inch on the heat exchanger.1.Protection class: IP54 or IP552.CL.B or CL.F3.Life at 25C: 50000hours4.Blade dia: 200,250,300,350,400,450,500,550,600,630,710,810mm5. ...