John McGaw wrote:
> On 2/25/2012 4:52 AM, Peter Chant wrote:
>> John McGaw wrote:
>> > I can't speak for every case under ever circumstance but I can say that
>> > over the decades every case I've had with a filter in it has had that
>> > filter ripped out pretty quickly. It is just too troublesome to
>> clean out
>> > a small filter which becomes clogged in no time but it is very easy to
>> > open a case and blow it out.
>> I would have thought that unless the filters had a far larger surface
>> than the fans they'd choke the fans and block up quickly.
> Yes, having a much larger filter would certainly be of help. I've seen
> computer enclosures that were made for use on the shop floor and they
> were inevitably entirely sealed or had large pleated filters that seem
> as though they'd be suited for an HVAC system. I don't see a lot of use
> for either in a home or office system so I just rip out the filters
> rather than clean them.
My Antec Sonata has a slide out filter, which is relatively large. It
slides out of the bottom of the case. When I get a Sonata case here,
I immediately remove that filter and chuck it back into the case cardboard box :-)
The filter would be a pain to get at, once the PC is set up. http://www.bjorn3d.com/Material/revi...i/cooling3.jpg http://www.bjorn3d.com/Material/revi...i/cooling4.jpg
The alternative dust control mechanism, is to observe what happens with
"positive" and "negative" pressure fan cooling setups, and how the
dust level inside changes with those. Once you figure out which
fan config does a good job on dust control, fitting filters is
less of an issue. (Both configs have dust, but the dust is light
enough with the good config, to ignore it.)
If equipment is in a dirty or corrosive environment, there may be good reasons
for "belt and suspenders" protection of the PC (like an external filtered cabinet
with its own fan, to hold the PC). High arrestance filters, need a fan similar
to the one in a vacuum cleaner, to get a good airflow. The one in the Antec above,
is similar to the lint filter in a clothes dryer, a simple plastic screening. I
don't think I'd really want to clean that once a month, as it means accessing
the bottom of the computer to pull the filter down and out. So I just remove
the filter entirely.
I have seen some pretty plugged up computers. On a machine at work,
I pulled enough hair from a Sun Sparc, to make a wig :-) The hair
was jam packed against the three cooling fans (they cool the processor module).
The computer had become so hot, because of the blockage, I couldn't touch the
heatsink on the processor, for about ten minutes after removing
power. I've never seen anything similar to that, on a PC. The funny
thing was, the computer wasn't throwing any errors at all. (The machine
had a processor upgrade, and I think those run pretty hot anyway.)
I only opened the machine up, because it "didn't sound right".
It sounded "muffled" for some reason :-)
With that much hair, I can only assume the user of that machine, is now bald.