On 25/08/2019 15.39, Mayayana wrote:
"Carlos E.R." wrote

|
| Some do have filters or grids. You just have to pay more.
| Antec, for instance.
|

Yes, so says Paul. I wasn't aware of that. I usually
pay $20 for a simple tin (or sheet steel?) case. I don't
need anything that looks like a Klingon dashboard
so I've never looked at the expensive boxes.

They have other advantages. Holes for more fans, several hard disk
trays, cushioned for reduced vibration (the vibration from one hard disk
head has been known to transmit to a nearby hard disk causing it more
read errors via positioning head errors because of the vibration at the
proper frequency). Double sheet sides, also to reduce sound transmission.

Filtered air intakes I have seen in ruggerized computer cases intended
for industrial environments. Imagine a machine shop, where the dust can
be metallic particles! Some of those boxes you can put on the floor and
jump over them, safely.


--
Cheers, Carlos.