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Originally Posted by Cathar
There are NO quiet >120mm fans that I am aware of. All the Comair-Rotron style fans certainly have very noticable amounts of bearing noise.
Need to remember Hoot, we're talking about the near-silence obsessed here. Fans that you can barely hear (or not hear at all) in a quiet room, with everything else turned off, in the middle of the night.
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The only thing that meets that criteria is a moderate to low CFM centrifugal blower and the size precludes mounting it in a case. I graduated from loud PCs when I migrated to water cooling several years ago, so I appreciate quiet solutions. In my P160 case, with the sides on, the 24V Patriot , run at 12V is almost inaudible. Certainly not obnoxious like my push-pull 120mm Panaflos were when I was using a "Chevette" core, though their noise was mostly attributable to having the pull fan not far enough away from the radiator fins (~12mm) and hearing the forced air rivulets sheer against the blades.
Edit: Also consider the EBM/Pabst 7112 available from
MPJA for the "Chevette" class of heater cores. Its 150x38mm size matches the 150mm footprint of that class of heater core perfectly.
Hoot