An update...
I picked up the same model of NMB fan recommended by EIMS, and I promptly installed it. It is quieter than the stock Panaflow, but not dramatically quieter. (Like the stock fan, this one is still plainly audible over the noisy HDD.) Of course, it is substantially more efficient...
Thank you, EIMS, for sharing your findings! The fan in my Mac II's power supply is about as irritating as it gets. Glad someone has done the research to find a viable replacement. I'll likely be purchasing the very model of fan you suggested using, and I'll eventually update the thread with my...
Sorry to reply to an old thread — I'm just wondering if you've since managed to resolve the issues with your IIci. I ask because my IIci, likewise, will no longer power up. It actually worked flawlessly, until I gave it a bath. Prior, it had been shoddily re-capped and was functioning but dirty...