Brian Beesley wrote: > On Wednesday 20 August 2008 19:40, Keith Alexander wrote: > >> No need >> to do anything electrical, just change which side of the fan is facing >> "out." Thoughts, anyone? >> > Used to be that this was thought to be a Bad Idea, mostly because you can't > pump air out without it leaking in somewhere, which was usually through the > floppy disk drive - where the heads got coated in the crap that got dragged > in along with the air. So it was generally agreed that the idea was to have a > positive pressure in the case. Maybe dirty floppy drive heads are no longer > an issue, but the principle that the inflowing air will be dirty is still > valid. > > Fact of the matter is, the leading edges of the blades will accumulate crap > anyway, this will reduce their efficiency leading to less air flow & higher > temps in the box. > > Some of my cases have several fans, some blowing in, some out (usually one > more blowing in than out). They all get dirty. The worst build up is around > the CPU heatsink fins, I have to vaccuum these out every six months or so. > > If you want to keep the innards of the case clean, then the only real option > is to use a fanless cooling system - i.e. a massive finned case acting as a > heat sink, maybe assisted with Peltier cooling modules or incorporating a > miniature refrigerator to carry the heat away. > > Regards > Brian Beesley > _______________________________________________ > Prime mailing list > [email protected] > http://hogranch.com/mailman/listinfo/prime > > __________ NOD32 3371 (20080820) Information __________ > > This message was checked by NOD32 antivirus system. > http://www.eset.com > > > > Thanks, Brian. I hadn't thought of that. You're absolutely right, of course. If air is being sucked OUT of the case, it's also going to be drawn IN somewhere else. Though I still hang on to one, most newer cases do NOT have floppy drives, but I suppose dust and lint COULD get sucked in through the gaps in the tray of your CD/DVD drive, and possibly cause problems.
Re: "positive pressure." I used to work as a central office tech. for the phone company, and I remember hearing that phone switching offices near the seashore in Florida were kept under "positive pressure" to keep the salt air from corroding the relays. Less of a problem now, as there are fewer and fewer relays to be seen in telephone offices. These days, all you hear are fans, not relays clacking. Keith Alexander -- "My view of reality is that it's always been a grim place to be...but it's the only place you can get Chinese food." Woody Allen _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
