So I was over at one of my fathers friends house today replacing his case fans with blue ones. when I was done I had a few fans left over and one of them caught his attrition. I replaced his 80mm fan with a 92 mm fan ( because that what he had the holes for on his case.) and he was wondering if I could mound the 80mm on the outside of the case. now I'm sure that you can do that, and it mite even hinder the air flow, but he wanted me to look in to it anyway. so thats my dumb question.