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Originally Posted by Hoot
I don't understand the obsession with 120mm fans. There are several OEMs of 180mmx50mm fans like the Patriot. While they are a tad big for the "Chevette" 150mm cores, they are a perfect match for the "Camaro" 180mm cores. The 24V Patriot, run at 12V is very quiet. With the fan and radiator having the same OD, you don't have to make a sloped shroud. Straight wall works perfectly. Given the tolerance of the Patriot for resistance, only one is needed in a pull configuration. I've tried two in push-pull with no improvement on heat exchange though they are louder.
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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.