■ the scope and purpose
      Fans of the series to contain the explosive mixture of coal mine gas, the exchange of 50 Hz, the voltage to 660 V power system for mining and mining roadway local ventilation.

■ main characteristics of
      Fan ventilation for the Axial-flow, the use of safe and reliable devices to prevent friction and sparks impact of special-design, explosion-proof electrical always in the fresh air in the operation, more security.