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Look at the Panaflo L model 120 mm fans. Those are so silent that you can't hear them from over a foot.
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Sound perception is very tricky. The silent you go, more background noises you start to hear. Your statment tell me that you're in a noisy ambient.
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Make one port on the top of your case blowing in
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With undervolted fans you don't want to fight against natural convection, but work with it. The highest point should have exhausts.
Maybe in a highly isolated case, an undervolted centrifugal fan could be more efficient. Those generate a lot more pressure than axial ones, and thats needed to move air through small vents.