Can anyone suggest a good brand of quiet bearingless fans to be installed in a AV cabinet. Thanks
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Although I have heard of magnetic bearings in industrial and scientific applications, I have not seen a "bearingless" computer-type fan offered for sale. Do you mean a fan with a quieter sleeve bearing as opposed to noisier ball bearings?
Although sleeve bearings are quieter (but generally not as long lasting) than ball bearings, most of the noise in a fan comes from the airflow. There are little engineering tricks that can reduce airflow noise a tiny bit (like the dimples on some Noctua fan blades), but it's mostly a matter of physics - larger diameter blades can turn slower and are quieter than smaller, faster turning blades.
Several manufacturers make 140mm fans with a low 16dB noise level. The CoolerMaster R4-S4S-10AK-GP 140mm fan has a 16dB rating at 1000rpm. It is rated at 35,000 hours, which if left on 24/7, would have a ~ 4 year life expectancy. The current draw is only 80mA, so a standard 12VDC/800mA power adapter would be fine for several fans.
They sell for around $10 each, and a 12VDC power adapter can be had for about the same. If you added a computer-type 12V fan control, you would be able to fine tune the airflow and noise level to your requirements.
SteveLast edited by srb; 03 July 2011, 10:10 Sunday. -
Thanks Steve Ill check it out.Comment
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These are the best. There's none better.... I have them in my server and they are virtually silent. All you can hear is the air moving which is a lot of air moving, but there's almost no noise AT ALL... at least not the fan itself. Best fans, they are pricey, but for anything I build from now one I won't buy anything else.
Newegg and Amazon have them.Digital Audio makes me Happy.
-DanComment
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You could even power it from your 12 v trigger output. Most will give you 100 mA so should work fine and also makes it convenient in day to day usage.Comment
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All I did for mine was use an old 200watt PSU, attach a relay to it and control it (off/on) from the 12v trigger. Was very easy to do... and with the 200w PSU being silent (no fan) it was a perfect choice!
Digital Audio makes me Happy.
-DanComment
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Moving the motor to the outside of the fan allows for greater surface area for fan blades. If the motor remains powerful enough this fan could be revolutionary.
http://www.ystech.com.tw/Tmd/tmd-0.htm
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