I don't use 3/4 of the 5" bays on my case (cit 1011B) and i was thinking of putting a 120mm fan there, but i'm not quite sure how to mount it, so that i would easily be able to take it out if i ever got another dvd drive. I was thinking mounting the fan on a black piece of acrylic but i don't want to glue or screw it in because it would leave holes if i used screws and i don't think i'd be able to pull it off if i glued it because the plastic is really brittle. Also i wouldn't be sure on what guard or grill to put over it or what brand of fan to use. I would prefer blue led fan for the looks but i'd probably go with a really noisy cheap one that looked good but didn't do much. i don't want to spend loads though just would like a fairly good cfm but im not too bothered about the noise.