Anyone familiar with this CoolJag line of 120x25mm fans?

Cerb

Elite Member
Aug 26, 2000
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The description of the bearing-type at the CoolJag website seems convoluted -- confusing.
"Bearing: Dual Ball bearing"
What's confusing about that?
There is no spec/estimation of MTBF on these. They're also pretty cheap.
MBTF they probably don't know, and most of the time, it's bogus, anyway.
But they're "PWM" and rated at above 110 CFM at dBA lower than 40.
Why the quotes? They're PWM fans.
http://www.cooljagusa.com/productshow.asp?id=313
They even list a RPM v. duty cycle chart, showing them to work at very low duty cycles.

They look like average cheap fans, and the specs don't look faked or exaggerated.
 

BonzaiDuck

Lifer
Jun 30, 2004
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"Bearing: Dual Ball bearing"
What's confusing about that?
MBTF they probably don't know, and most of the time, it's bogus, anyway.
Why the quotes? They're PWM fans.
http://www.cooljagusa.com/productshow.asp?id=313
They even list a RPM v. duty cycle chart, showing them to work at very low duty cycles.

They look like average cheap fans, and the specs don't look faked or exaggerated.

Now, now.. . there, there, now . . . no reason to act irritated. . .

You're right about all this. . . They're likely "average" and certainly cheap. What I discovered in the interim: they are capable of some degree of motor-whine above a certain RPM.

It's a shame, really . . . The CFM and dBA spec seem right for want I was seeking. Guess I need to keep looking.
 

Cerb

Elite Member
Aug 26, 2000
17,484
33
86
Now, now.. . there, there, now . . . no reason to act irritated. . .
Sorry, not trying to be. :oops: Probably crap getting out of my system (antibiotics, steroids, and opiates, yuck!).

What I discovered in the interim: they are capable of some degree of motor-whine above a certain RPM.
All ball bearing fans will either have, or develop, whine or buzzing, eventually, anyway. 'Tis their nature.
 

BonzaiDuck

Lifer
Jun 30, 2004
15,891
1,554
126
Sorry, not trying to be. :oops: Probably crap getting out of my system (antibiotics, steroids, and opiates, yuck!).

All ball bearing fans will either have, or develop, whine or buzzing, eventually, anyway. 'Tis their nature.

What about spooging the bearings with Teflon gun-grease here and there?

What's the alternative? Hydro-dy-namic? Sleeved? Mag-Lev?