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Originally Posted by bobkoure
Given the BIP II with 1" shroud box, why not simply block off the area for one fan and use a single 120x38mm fan to pull? Contra-wise, that shroud is simply adding plenum as the BI rads are already shrouded. I've tried extra plenum on BIPs (Is not IIs) and have seen a slight improvement when adding it on the push side, but no improvement when used on the pull side - so you could likely ditch the add'l shroud and get a little extra space, which might reduce exhaust turbulence.
If you are looking to reduce noise, you don't really need 38mm thick axial fans to pull through a BIP. I've had best luck with Nexos 120x25mm fans. I've recently found look-alikes (from the same fan manufacturer) at isellsurplus .
A second 120mm Panaflo 'L' might quiet things as well - although the Panaflos (the ebm/papsts too, come to think of it) do not like being speed controlled with PWM. Are you getting a "ticking" noise? Try speed controlling with simple resistance. |
Thanks for that Bob
The Papsts make more of a slight irritating whine even at 12 volts. I'm using a Nexus fan controller which controls the Panaflo L1A nicely without ticking. Tempted to get another L1A, although I've heard good things about the Nexus fans too. I'm in the UK so not economic to buy the generic ones you mentioned, but thanks anyway