with IE4 indicators of energy efficiency?The rotor magnetic steel: Build-inCooling fan:With the motor shaft with same speedInstallation dimension: Standard IMB3 , meet IMB5 ,IMB35Certification: CELevel of protection: IP55It design novel structure and torque than the big volume ,the volum is the same as power Y series motor shrink up to 30% .Power factor than Y series motor hint of up to 15% .Motor is quiet and high overload at low temperature characteristics etc .It is the fan ,water pump indus