Protection class IP55 Insulation class F
Naming rules:F=Fan B2=Two Blades P4=Four Poles D660=The diameter of impeller is 660mm.
NOTE:
1.The Fan performance parameters wer measured according to ISO 5801:1997(E)、<<Industry ventilation Fan Testing Standard>>、Experiment type A.
2.Noise levelis measured at 2M from the fan.
Protection
class IP55 Insulation class F
