I just did this myself and thought I'd share. I've got an antique vid card that runs hot all the time. After a typical day the thing gets so hot you can barely put your fingers on it. So, with some scissors and a sheet of screen door material, I temporarily fixed it. My vid card is in the top slot, so moving it around wasn't an issue. My modem, however, needed to be moved. It's now sitting in the bottom PCI slot. Anyway, I removed two filler strips from the expansion slots that weren't being used. This opened a nice-sized hole in the back, right below that toasty vid card. I could've left it at that, but the computer room is dusty. Shot carpeting doesn't help any either. Then I cut a piece of screen door material that spaned both holes and then some. Once I had that piece cut right (only took two tries) I clamped it in place using the modem's mounting bracket. With a screw driver, and a little effort, I wedged the other side up under the vid card's bracket. Now I've got a two-slot hole in the back, sucking in gobs of cold air, with a dust screen in place. And all that nice cold air goes right under the video card before getting blown out. Thanks to my motherboard, the vid card and modem face down instead of up. So the heat gets blown towards the front of the case, then it's sucked up and out the cooling fan.
Kinda nifty, and it's running cooler than ever now. With a little dryer ducting and a high-speed fan I could probably make this thing run ice cold all the time.
-----------------------
Flakbait [Delta6]
Delta Six's Flight SchoolPut the P-61B in Aces High"For yay did the sky darken, and split open and spew forth fire, and
through the smoke rode the Four Wurgers of the Apocalypse.
And on their canopies was tattooed the number of the Beast, and the
number was 190." Jedi, Verse Five, Capter Two, The Book of Dweeb 