I pulled one of the fans out... I love hot-swappable gear. It's a Delta afb0912vh, and there are six of them. The specs:
Recommendations for replacements?
Edit: I just sketched out a network reorgnization that will put the server in the storage room rather than out in the open. It's a royal bitch, 'cause there's no good way to do the cabling other than running it all the way around the perimeter of the loft, but I think it's worth it.