Mount your fan on a 30x30cm² plate and you have a very decent approximation of an "infinite plate". Or add a 12cm diameter sewer duct to the front or the back of the fan. I think the "infinite plate" is needed to eliminate direct airflow shortcircuiting around the edges of the fan. Any of the above...

One little question, Pierce:

What graphics card are you using? From what I've heard, the passively cooled MSI 8600 GT doesn't fit ... It's heatpipes are slightly too high ...

Actually I'm looking for a 8600 GTS variant that's passively cooled. Any information?

Currently working at a high-end projector manufacturer, I was recently confronted with an aspect that did not come to my mind when thinking of cooling technology: the influence on cooling capacity of the atmospheric pressure. We installed an 6-projector system in Mexico City, which kept on shutting ...