2.Each stage is driven by an electric motor of the same power rating. The impeller is directly connected with the motor shaft, and the impeller rotates in opposite directions between the adjacent two stages. After entering a blade wheel to obtain energy, the gas is accelerated through the secondary impeller discharge. The rear impeller of SDF tunnel fan has the static blade function of axial fan to increase gas flow and achieve higher wind pressure and efficiency.

3.The fan can be removed from the middle flange and used in a separate section.However, care should be taken to prevent foreign inhalation of damage to the impeller.