Multiple small fans are quieter than a single large one. It might be a little more money, but it sure beats getting a large silent fan that's overpriced.
As for flow, more is always better, but all in all, your requirements precede the importance, so just forget about it.
Have you considered a circuit to lower the voltages? You can then get your fan(s) to be silent, very easily. You can then play with it to see the cooling improvement of noise levels, and determine quite on your own the amount of noise versus cooling that you're willing to live with.
|