Fan will only broke if you leave your PS3 24/7 on (seriously as I said before, even with a stock fans in PC doesnt get broke after 5-6 years of nonstop use, also they also tend to break if you place your PS3 where humidity is high like near in kitchen where the nasty deposits may harm the fan bearings. Its a brushless fan and the spec of the fan is technically fit for speed up to 12volts which is equal value for FF.
Also PS3 wont turn on without fans rotating, it works just like what other modern pc right now, if the processor's fan doesnt spin, the BIOS will tell that there's something wrong with the CPU fan and it will be shutdown in few seconds. Same with PS3, though this time it will beeps with 2 and shutdown, not 3. Sony isnt that idiot that they forgot to put something that simple protection about fan not working error.