Hmm yes I realised last night while in bed (weird what you think about) that I might have been wrong about positive pressure being applicable to computer cases. I guess the "dust-free outside air source" is supplied by the fans drawing air in. Seeing as less air is being sucked out by the extractor fan, positive pressure is maintained, and dust is less likely to get in via other (non-filtered) holes in the case.
My apologies. I wonder how it affects temperature?
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