I believe they are intended to blow out the slot. I took mine out because it was competing with the psu, which also blows out. I guess I could have reversed the wires, and got it to run backwards, but it is a centrifugal fan and you're not going to get anywhere near the same CFM running it backwards.
BTW, very proud this thread has been up for this long without any juvenile remarks. I have exhibited remarkable restraint.
I'm sure it blows as well (as he tries very hard to hold back juvenile remark). I had one on my first computer build, but took it off as I later found out it really wasn't needed for my particular design and parts.
I have a thermaltake SL1 blowing hot air out of my case at the moment. I would be better served by it pulling cool air in... does anyone know if it is possible to reverse the air flow? How would I go about doing that? Disabling the annoying blue LED would be a plus too.