28 Oct
2006
28 Oct
'06
11:18 a.m.
One of my H960's actually came to me with a fan already installed in the
top. I have a few loose fans, and my other H960 has no fan so I'm getting
ready to install one of those condor fans in my H960. I am wondering if the
H960 fans at the top are supposed to pull air in, or push air out? I'm more
interested in how DEC actually shipped them rather than "it'll work either
way".
I checked my H960 and it's set to pull air in from the outside downward into
the rack. Of course I have no way of knowing if that's how it originally
was, or if some collector/scrap person put it in backwards themselves.
Anyone set me straight on this? I suspect that's how it's supposed to be
given the channel on top for an air filter of some type.
Also, I'm working on the last H960 for my collection, and I have leftover
one of the antitip feet that stick out the front. If you're standing in
front of the front of the rack facing it - it's the right leg. Anyone wants
it - cost = shipping.
Jay West
28 Oct
28 Oct
11:41 a.m.
On 10/29/06, Jay West <jwest at classiccmp.org> wrote:
One of my H960's actually came to me with a fan
already installed in the
top. I have a few loose fans, and my other H960 has no fan so I'm getting
ready to install one of those condor fans in my H960. I am wondering if the
H960 fans at the top are supposed to pull air in, or push air out? I'm more
interested in how DEC actually shipped them rather than "it'll work either
way".
My recollection is that DEC fought physics and pulled air in from the
top and exhausted it from the bottom of H960 racks.
No idea why they thought that was a good idea.
-ethan
8:05 p.m.
Jay West wrote:
One of my H960's actually came to me with a fan
already installed in the
top. I have a few loose fans, and my other H960 has no fan so I'm getting
ready to install one of those condor fans in my H960. I am wondering if the
H960 fans at the top are supposed to pull air in, or push air out? I'm more
interested in how DEC actually shipped them rather than "it'll work either
way".
I checked my H960 and it's set to pull air in from the outside downward into
the rack. Of course I have no way of knowing if that's how it originally
was, or if some collector/scrap person put it in backwards themselves.
Anyone set me straight on this? I suspect that's how it's supposed to be
given the channel on top for an air filter of some type.
I'm in the early stages of work on a PDP-12, and found that one of the
two ceiling fans was disconnected - turns out it has a bad squeak; I
suspect they unhooked it so they didn't have to listen to it - and
discovered, to my surprise, that both fans are set to suck air downward.
So not a _definitive_ answer, but certainly another data point suggesting
yours is normal. :)
-O.-
10:24 p.m.
Hi Jay,
I believe they were shipped from the factory with the fans blowing downward,
thus the channels to hold the filter on top of the cab.The thought might
have been not to bring contaminants up from the floor, and there was enough
airflow to dissipate the heat. Not all computer rooms were really clean.
If the customer had a raised computer floor, the filters were taken off and
the fans reversed, to work with the clean air coming in from the bottom.
Paul Anderson
On 10/28/06, Jay West <jwest at classiccmp.org> wrote:
One of my H960's actually came to me with a fan already installed in the
top. I have a few loose fans, and my other H960 has no fan so I'm getting
ready to install one of those condor fans in my H960. I am wondering if
the
H960 fans at the top are supposed to pull air in, or push air out? I'm
more
interested in how DEC actually shipped them rather than "it'll work either
way".
I checked my H960 and it's set to pull air in from the outside downward
into
the rack. Of course I have no way of knowing if that's how it originally
was, or if some collector/scrap person put it in backwards themselves.
Anyone set me straight on this? I suspect that's how it's supposed to be
given the channel on top for an air filter of some type.
Also, I'm working on the last H960 for my collection, and I have leftover
one of the antitip feet that stick out the front. If you're standing in
front of the front of the rack facing it - it's the right leg. Anyone
wants
it - cost = shipping.
Jay West
6481
days inactive
6482
days old
3 comments
4 participants
participants (4)
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ethan.dicks＠gmail.com -
jwest＠classiccmp.org -
ohh＠drizzle.com -
useddec＠gmail.com