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shiltz going by what you said you're looking for this may be a fan you would want to look at, http://www.directron.com/fanal12025b.html, 120MM X 25MM, Air Flow: 79.14 CFM @ 12V, Noise: <30 dBA, I use them in my watercooled dual athlon system and i'm gona be using them for the watercooling setup for my new system, they are nice and quiet with good airflow.
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Possible, but there are two possible problems with that fan (you might want to think about the second yourself).
1. I've already got much of the duct work built, and it was designed around a 38mm fan.
2. According to everything I've read on fan selection, 25mm fans can't pull a good load against resistance. If you look at the P-Q curves on most fans you'll notice that at the same free-air CFM ratings, 25mm fans have a lower SP rating, and generally have a curve that drops much faster. Given that I'll be pulling against a heavy resistance, I want the extra Static Pressure that you get with the thicker fans. 25mm fans are good for exhaust fans and other places with low flow restriction, but they tend to loose it under load.
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Zhentar two things- first, fans are noisier when they suck. Second... Those panaflos at a full 12v aren't good enough for a SPCR person, but between undervolting and the high resistance of the rad, you'll probably end up dropping below that 80 CFM youwant. Maybe you should look into some automotive blowers?
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1. The 80 CFM number is based on a VERY conservative heat budget, I suspect I can get away with alot less in actual practice.
2. Keep in mind that I'll be using two fans in parallel, so each one only has to actually move 40 CFM to give me the 80CFM value. Judging by the PQ curves and the articles that BillA wrote on fan pressure drops going through a rad, I'm anticipating that I will only loose about 30% of the free air CFM, so again there should be plenty of margin. (BillA ranked on the Panaflos, but if you read the article real closely you'll note that it was only the 80mm's that he was having a real problem with. The 120mm's were OK)
4. Even if the Panaflos don't work, I'm sure the SanyoDenki's will, as they are much higher volume, and they also have good Static Pressure ratings.
5. Noise will have to make it through the rad in order to come out the front of the case - if I'd set the fans up to blow, then they would have been at the front of the case with nothing to block their radiation.
6. Automotive blowers have a right angle turn between the intake and output, which is OK for some applications, but in my setup it isn't - I need the straight through flow path you get with an axial fan.
Good comments though.
Gooserider