Learn by first maybe by consulting manufacturers. If makes little
difference to chassis whether fan blows in or out.
[ much more snipped ]
Fella, you're really heavy on the theory, waaay too light on actual
real-world experience.
If you blow air INTO a chassis you have a chance of filtering the air
at the intake
If you blow air OUT of a chassis, every llttle gap, unfilled screw
hole, floppy disk slot, CD drive slot, and poorly sealing cd drive
tray will let in dust.
Again, direction of airflow makes no difference to chassis
temperatures.
In theory, maybe. But fans tend to blow air in a particular
direction, but they all suck equally. (ha). So if a fan happens to
blow onto a CPU heatr sink, the heat sink will be substantially cooler
than if the fan just sucked in general.
It sure does matter whether you suck air out or blow it in,as the cases
have been designed with the fans at the TOP of the case,and *heat rises*.
Reverse the airflow,and the lower components will not get the airflow.
Maybe if you took off the left side panel and mounted your filtered fans
near the bottom of it,blowing in,then your intake of dust would stop.
Then you have to contend with filter maintenance.
Filters reduce airflow,and clogged filters even more.
Yeah,there you go;mount a couple of thin 12VDC fans on the lower part of
the case,on the inside,mount two metal channels for a small fiberglass
furnace filter to slide into,on the outside of the case,use a long enough
fan power cable to allow removal of the side panel for accessing the
inside.You still end up with a thin case profile,the filter is easily
accessible for service,too.
Leave the PS fan and the optional case fan to suck out.
There still will be enough overpressure to eliminate intake of dust from
other openings.
Those openings will leak some air out instead.
Consider this my patent on the idea. B-)