[173890] in North American Network Operators' Group
Re: AM dust filters
daemon@ATHENA.MIT.EDU (Jason Lixfeld)
Tue Aug 12 15:52:07 2014
X-Original-To: nanog@nanog.org
From: Jason Lixfeld <jason@lixfeld.ca>
In-Reply-To: <53EA6959.5020002@dougbarton.us>
Date: Tue, 12 Aug 2014 15:52:04 -0400
To: Doug Barton <dougb@dougbarton.us>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Aug 12, 2014, at 3:22 PM, Doug Barton <dougb@dougbarton.us> wrote:
> On 08/12/2014 11:19 AM, Jason Lixfeld wrote:
>> Hi,
>>=20
>> I'm interested in knowing what sorts of material folks use to make =
after-market dust filters for their various devices which wouldn't =
normally have any. This seems to almost be a necessity when these kinds =
of devices are deployed in environments that are overly dusty and dirty =
(it should also be implied that these environments are all in-doors and =
would have less than ideal airflow and climate control).
>>=20
>> A material that is too dense will hider airflow and cause an =
immediate increase in inlet temperature, which would exacerbate a =
potentially threatening temperature situation in environments where the =
ambient temperature is already in the mid to high twenties and above =
(that's 77 - 86F+ for my American friends ;)). A material that is not =
dense enough won't do a very good job at filtering.
>>=20
>> Do folks just hack up HEPA filters or something?
>=20
> It sort of depends on what kind of stuff you're trying to filter out.
Small-ish stuff. Your every day, run of the mill fine grain dust, =
tracked-in dirt & sand, some construction particulate (metal shavings, =
etc).
> Panty hose actually makes a reasonably good filter for larger stuff, =
but Tom's question about how often are you going to service it comes =
into play, since you need to remove the debris that it catches =
periodically in order to avoid obstructing the air flow excessively.
Yup. Depending, either a vacuum or a straight-up replacement of the =
'filter', I'd suspect. Or maybe just a good shake in some cases.
> OTOH, you also have to have some thought towards what are the benefits =
of not having the internals of the system coated with dust, vs. slightly =
reduced air flow.
Indeed. The internals can definitely handle non-metalic dust, as well =
as a pretty wide temperature range (caused by either reduced airflow or =
an increase in ambient temperature, or both), so I'd imagine it would be =
a appropriate balance between the two.
> Tom's suggestion of a pressurized cabinet is a good one of course, but =
that's not possible in all situations.
