Using a 2 mm Allen key, unthread the two 5.5 mm screws from the nozzle fan casing. Unthread the top screw and then the side screw as shown.

While unthreading the screws, hold the fan casing with one hand so as not to allow it fall once completely detached.

Once the fan casing is detached, ensure that it's positioned in a way that doesn't damage the external wires and attachments.