yes, it is an 80mm fan. it is not a simple swap out tho. I am unsure of the monitoring technique they use in this thing. The distributor/manufacturer kepco is sending me a maintenence manual so I can find out how to replace it. The fan is very nevessary for this unit in it's factory form tho. do not try to take it out entirely without first replacing the small heatsinks inside with larger ones
I'll let you know when I find out more....
--Matt