Safety notice!
Ensure the load frame is powered down and disconnected from the mains supply before begining.
Remove the screws holding the backpanel to the load frame. (See picture right).
Identify the fan on the backpanel. Indicated by red box in the picture on the right.
Remove the fan as indicated.
Fitting the new fan is reversal of the process used to remove the old one. As is fitting the backpanel to the load frame .