Well my setup is non-standard..... it uses three 140's as intake fans, plus the 140 on the Zipang. They're all speed controlled by different sensors. I did try using the Zipang fan as the center intake fan.....didn't work out. The temperatures around the board did not change at all even when the Zipang fan was turned on at 12V. So now I'm using two medium speed Yate Loons and an Evercool Red Scorpion as intakes. The Yate Loons are plenty quiet even at 12V, but the Evercool seems to blow more air, but is more noisy of course.
The poor Zipang fan sits in a box somewhere.