1. Open the controller box. (Opening the Controller Box)
  2. Remove the controller box cover. (Removing the Controller Box Cover, Inner Cover)
  3. Locate the fan [A].
  4. Disconnect the fan inside the controller box (x1, x1).
  5. Remove the filter bracket [A] (x2).
  6. Disconnect the fan [B] (x2).
  7. Remove the fan.