Sam wrote: > My line of thinking is more like this: if the original fan is for pulling > air out of the enclosure from the back, it means the enclosure is made to > have air vents for the ingress of cool air which flows over the hot > components, effecting ventilation. If an additional fan is put there to pull > out air as well, it means that the rate of ingress of cool air will be > increased, thus increasing cooling; but if the additional fan pushes air in, > the ingress of air from the vents would decrease, which probably would > diminish the rate of cooling. Any thoughts on that?
I sold my last C600 years ago, so I'm having to work from pictures and memory.... You'd have to try the fan in different places and measure the temperature at specific points if you want to maximize cooling. We really weren't that particular about cooling in the C-series machines. We built them as cheaply as possible. The cases were all off-the-shelf designs from Palo Alto Designs. Our general rule for cooling was: Heat Rises. If you're going to add a fan in a tower machine to supplement the power supply fan -- which is in the upper back quadrant -- then add the other fan in the lower-front quadrant. This should, in general, draw cool air in down low and blow warm out, all in in the natural way that cool air and warm air travel. This is very easy to accomplish in the S900, which has a fan bay in the lower front quadrant of the drive. Short of drilling holes in the bezel, however, I'm not sure how one would accomplish the same setup in a C600. Your line of thinking is interesting, but I'm not sure it would matter. If the power supply fan blows air out faster than the secondary fan draws it in, then you're going to be drawing air in from somewhere other than the secondary fan's intake, so you wouldn't be decreasing the overall ingress of fresh air. Conversely, if your power supply fan blows air out slower than your secondary fan draws it in, then that extra air will escape via channels other than the power supply fan. Either way, you're not reducing the overall ingress of fresh air. -Kennedy http://home.earthlink.net/~supermac_insider/ -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/supermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
