AXIAL FANS (adjustable blade angle)
  The casing is made of steel,the interior wings are made of
  aluminum alloy.
  According to the variations of the air capacity in different
  working places.the air capacity and air pressure haver to be
  changed along with the blade angle.There are 3 designs:

  1. Electric driven machine directly connected.
  2. Spray and increasing moisture type
  3. Twisted tube and directly connected type for motor
     outoomingtubes and air for protecting explosion and
     against the corrosion.