I disassembled my Drobo and replaced the fan this morning. I had two 120mm fans laying around…one pulled the proper amperage but pushed less air, the other pushed more air but pulled twice the amps. I chose the first one. I also blew out all the accumulated dust while I had it apart.
hi dragon, its cool you were able to find a fan to fix yours.
if the fans are fairly cheap it might be worth getting one while its on sale so that it becomes one laying around, but hopefully the other fan will last you a long time. (just keep an eye on your heat levels if its not blowing enough air then it might be worth getting the other one for 10 pounds or so to play safe)