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Old 08-25-2007, 11:41 PM   #11 (permalink)
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Default Re: Fans

2 Ball and Fluid Dynamic are good.. if you are looking for decently priced, quiet fans check out Yate Loons at jab-tech.
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Old 08-25-2007, 11:57 PM   #12 (permalink)
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Default Re: Fans

There are only 2 types of bearing coming in fans

1: Fluid Bearing (cheaper cost, less life)
2: Ball Bearings (higher cost, longer life)

some fan manufacturers as well include a combination of Fluid and a Ball Bearing, which are done in most of the fans. even with fluid bearings, the MTBF is 3 years, after that the fan starts giving out noise (happens in many OEM CPU fans). but you will notice one thing, fans with Fluid bearings are easy to rotate, therefore, ideal for noise reduction. its always recommended to get a BIGGER fan, as they tend to rotate slowly and draws out equal amount of air. a 1250RPM of 120MM bracket size fan is sufficient to draw out warm air out of the system quiet efficiently. but make sure, you equalise the air in = air out. does means, you have 2 80mm fans running each drawing in 30CFM and 1 bigger fan alone drawing out 37CFM. 5CFM +/- is still good ratio. in most cases, just one fan will do the job at back, as then it will draw in air from places (holes) making ambient cooling effect through out system (cooling motherboard, PCI cards, hard drives).
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Old 08-26-2007, 12:37 AM   #13 (permalink)
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Default Re: Fans

I would go for the Ball Bearings or Sleeve. I think the Tricool is 2-Ball or something but my 80mm Exhaust fan has sleeve and it's working great.
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Old 08-26-2007, 02:05 AM   #14 (permalink)
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Default Re: Fans

Ah, alright. But what's the main difference between bearings?
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Old 08-26-2007, 05:09 AM   #15 (permalink)
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Default Re: Fans

Question:

What is the difference between Sleeve and Ball bearing fan?

Answer:

The main difference is the life time of the fan. Sleeve bearing fans have a life time of 30.000 life hours and Ball bearing fans 50.000 life hours. The technical difference is that a Sleeve bearing fan is running on metal and oil only. The Ball bearing fan is running on small steel balls around the axle.
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Old 08-26-2007, 03:34 PM   #16 (permalink)
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Default Re: Fans

Nick has your answer. So that's why my exhaust fan was leaking some oil substance.
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Old 08-26-2007, 03:52 PM   #17 (permalink)
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Default Re: Fans

i idnt actually reed what i posted, just copied it off some site, wow, those fans run on oil!!
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Old 08-27-2007, 01:21 PM   #18 (permalink)
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Default Re: Fans

But what about all the other fancy named bearings?
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Old 08-27-2007, 01:33 PM   #19 (permalink)
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Default Re: Fans

Just keep in mind that the 2-Ball bearings have a longer life span.
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