I picked up a PCI slot fan on eBay, to keep my computer cool during the summer. The ambient temperature goes up a lot in this apartment. Anyway, as soon as I opened the package I realized there was no way this honking great thing would fit in my tiny Shuttle PC. I don't know what I was thinking when I bought it. I've just taken the cover off to confirm that there isn't room, and I don't think even a small slot fan would fit. Fortunately, I only paid a buck for it on eBay. If my computer gets too hot in the summer, I may just leave the cover off, as it runs cooler that way.