Sleeve bearing fans

Do sleeve bearing fans have that much of a shorter life compared to
ball bearing fans? I'm referring to case fans. I like the low dBa's
of the Papst fans, but I found out they are sleeve bearing, which I
believe doesn't last as long as single or double ball bearing
equivalents.

~ Adrian ~

---
"I have often regretted my speech, never my silence."
Xenocrates (396-314 B.C.)

"Adrian" wrote in message
. ..
Do sleeve bearing fans have that much of a shorter life compared to
ball bearing fans? I'm referring to case fans. I like the low dBa's
of the Papst fans, but I found out they are sleeve bearing, which I
believe doesn't last as long as single or double ball bearing
equivalents.

Double ball bearing are of higher quality and longer life.

Adrian wrote:

Do sleeve bearing fans have that much of a shorter life compared to
ball bearing fans? I'm referring to case fans. I like the low dBa's
of the Papst fans, but I found out they are sleeve bearing, which I
believe doesn't last as long as single or double ball bearing
equivalents.

Not all sleeve bearings are created equal. Papst utilizes SINTEC sleeve
bearings in some of their fans, with MTBFs near that of ball bearings.

Read http://www.ebm.com/pdfs/motor.pdf

Sleeve bearing fans reliability also depends if they are input or exhaust
fans. Heat is the enemy of sleeve bearings, and they survive longer in a
25 degree C environment rather than a higher temperature (exhaust) one.

Do you know anywhere in the US that sells these fans? Especially in
120x120x38 (or x32) size? All I can find are places in Europe.

Thanks.

~ Adrian ~

---
"I have often regretted my speech, never my silence."
Xenocrates (396-314 B.C.)

Thanks for the information.

Is Papst a good make? Problem is, I can't seem to find them here in
the U.S. I'd like to think Papst is a good make, being German. I
would need one in 120x38mm form.

~ Adrian ~

---
"I have often regretted my speech, never my silence."
Xenocrates (396-314 B.C.)

Zalman's case fans are sleeve bearing too.

I have several and like them alot. Move very high amounts of air at
way lower dB than bearing fans. Only draw back, you can never place a
sleeve bearing fan horizontal or you have almost instant bearing
failure.
_________________________
When your PC gives a little they give alot:
http://tinyurl.com/hhez

http://www.directron.com/120mmfans.html

Adrian wrote:

Thanks for the information.

Is Papst a good make? Problem is, I can't seem to find them here in
the U.S. I'd like to think Papst is a good make, being German. I
would need one in 120x38mm form.

~ Adrian ~

---
"I have often regretted my speech, never my silence."
Xenocrates (396-314 B.C.)