X.F..

  1. Loosen the 8 screws [1].
  2. Remove the 2 fan guards
  1. Remove any dirt from the fan wheel, fan guard, and protective grid using a hard brush, for example.
  2. Assemble the two fan guards in reverse order.
  3. Before restarting the fan, make sure the fan guards are mounted properly. The fan must not touch the fan guard.