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fans -- the way the wind blows?



 
 
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  #1  
Old February 16th 06, 10:31 AM posted to alt.sys.pc-clone.dell
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Default fans -- the way the wind blows?

I've got two 620's on which I'm replacing various fans. To my surprise, on
one 620 the CPU fan was originally installed to blow into the case, on the
other it was blowing out. Presumably that latter is the correct orientation
(exhaust), but could someone confirm that? The service manual says nothing
about the orientation of any of the fans. Can't believe they installed one
of them backwards.

These machines also have an expansion-card fan which blows in--is that
correct, or is everything supposed to be exhaust? It's at the front of the
machine, so I'm guessing it's facilitating air flow from front (intake) to
back (exhaust).

Lastly, are these chassis designed to operate best with all the unused card
slots covered, or is there a cooling benefit to removing them?

Thanks for your help.

Michael Roper


  #2  
Old February 16th 06, 12:43 PM posted to alt.sys.pc-clone.dell
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Default fans -- the way the wind blows?


"Michael Roper" wrote in message
...
I've got two 620's on which I'm replacing various fans. To my surprise,
on one 620 the CPU fan was originally installed to blow into the case, on
the other it was blowing out. Presumably that latter is the correct
orientation (exhaust), but could someone confirm that? The service manual
says nothing about the orientation of any of the fans. Can't believe they
installed one of them backwards.

These machines also have an expansion-card fan which blows in--is that
correct, or is everything supposed to be exhaust? It's at the front of
the machine, so I'm guessing it's facilitating air flow from front
(intake) to back (exhaust).

Lastly, are these chassis designed to operate best with all the unused
card slots covered, or is there a cooling benefit to removing them?

Thanks for your help.

Michael Roper


Michael -

I assume you're talking about the Optiplex GX620. Which specific form
factor/chassis do you have there?

Mini-Tower (biggest, standard tower)
Desktop (horizontal or vertical use, mid sized)
Small Form Factor ( also horizontal/vertical, smallest)


Stew


  #3  
Old February 16th 06, 02:01 PM posted to alt.sys.pc-clone.dell
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Default fans -- the way the wind blows?

Lastly, are these chassis designed to operate best with all the unused
card slots covered, or is there a cooling benefit to removing them?


I'd say that was right, look at it like a jet engine, cool air sucked in hot
air expelled out. Removing the pci slot panels usually disturbs the air
flow.


  #4  
Old February 16th 06, 07:08 PM posted to alt.sys.pc-clone.dell
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Default fans -- the way the wind blows?

S.Lewis writes:
I've got two 620's on which I'm replacing various fans. To my
surprise, on one 620 the CPU fan was originally installed to blow
into the case, on the other it was blowing out. Presumably that
latter is the correct orientation (exhaust), but could someone
confirm that? The service manual says nothing about the orientation
of any of the fans. Can't believe they installed one of them
backwards. These machines also have an expansion-card fan which blows
in--is
that correct, or is everything supposed to be exhaust? It's at the
front of the machine, so I'm guessing it's facilitating air flow
from front (intake) to back (exhaust).

Lastly, are these chassis designed to operate best with all the
unused card slots covered, or is there a cooling benefit to removing
them?


I assume you're talking about the Optiplex GX620. Which specific form
factor/chassis do you have there?

Mini-Tower (biggest, standard tower)
Desktop (horizontal or vertical use, mid sized)
Small Form Factor ( also horizontal/vertical, smallest)


Oops, sorry. I didn't realize they reused model numbers. It's a Precision
Workstation 620 (mini-tower), circa 2000. Its serial number is 12UCB (its
sister is identically configured). A heavy-duty affair.

Michael Roper


  #5  
Old February 16th 06, 09:32 PM posted to alt.sys.pc-clone.dell
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Posts: n/a
Default fans -- the way the wind blows?


"Michael Roper" wrote in message
...
S.Lewis writes:
I've got two 620's on which I'm replacing various fans. To my
surprise, on one 620 the CPU fan was originally installed to blow
into the case, on the other it was blowing out. Presumably that
latter is the correct orientation (exhaust), but could someone
confirm that? The service manual says nothing about the orientation
of any of the fans. Can't believe they installed one of them
backwards. These machines also have an expansion-card fan which blows
in--is
that correct, or is everything supposed to be exhaust? It's at the
front of the machine, so I'm guessing it's facilitating air flow
from front (intake) to back (exhaust).

Lastly, are these chassis designed to operate best with all the
unused card slots covered, or is there a cooling benefit to removing
them?


I assume you're talking about the Optiplex GX620. Which specific form
factor/chassis do you have there?

Mini-Tower (biggest, standard tower)
Desktop (horizontal or vertical use, mid sized)
Small Form Factor ( also horizontal/vertical, smallest)


Oops, sorry. I didn't realize they reused model numbers. It's a
Precision Workstation 620 (mini-tower), circa 2000. Its serial number is
12UCB (its sister is identically configured). A heavy-duty affair.

Michael Roper


Michael,

http://support.dell.com/support/edoc...n/sm/remmt.htm

Gotta be honest and say that I don't know. Most Dimension/Optiplex units
pull air over the passive heatsink and exhaust it out of the case.

The only exceptions I've seen have been either fans mounted directly onto
the heatsinks pulling air over and out from the CPU (PIII/Celeron era), or
the dual-fanned GX520 SFF which had two fans in a "tunnel" formation; one
mounted in front of the heatsink, the other behind - and both pulling air in
the same direction out of the case.

The Dim4700 actually had a single fan pulling air in, blowing it over the
heatsink - but I think that was a fluke of sorts.

Typically, the labeled side of the fan is the exhaust side.

Stew


  #6  
Old February 17th 06, 04:52 AM posted to alt.sys.pc-clone.dell
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Default fans -- the way the wind blows?

S.Lewis writes:
Gotta be honest and say that I don't know. Most Dimension/Optiplex
units pull air over the passive heatsink and exhaust it out of the
case.


Thanks Stew. I'm going with what seems the logical approach and making the
fan at the front vent an intake (which it was already configured to be on
both machines), and all the fans on the back side exhaust.

If it catches fire, I'll try something different.

Michael Roper


  #7  
Old February 17th 06, 11:00 AM posted to alt.sys.pc-clone.dell
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Default fans -- the way the wind blows?


"Michael Roper" wrote in message
...
S.Lewis writes:
Gotta be honest and say that I don't know. Most Dimension/Optiplex
units pull air over the passive heatsink and exhaust it out of the
case.


Thanks Stew. I'm going with what seems the logical approach and making
the fan at the front vent an intake (which it was already configured to be
on both machines), and all the fans on the back side exhaust.

If it catches fire, I'll try something different.

Michael Roper


Cool.

Just don't let the "magic smoke" out of the box.


Stew


 




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