It technically doesn't, but a lot of people like to do it that way because the air doesn't have to be forced against gravity to get down to the trap. My setup (which I'm actually assembling right now on the floor) has a single-pass heater core mounted vertically in the back panel of a full tower with the upper fitting going straight across and into a bay reservoir. I figure this should be pretty efficient at catching air quickly.
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Abit NF7-S ... xp1800+ ... Abit GF4ti4200 ... Maxtor 120gb SATA150
Currently gathering parts to water cool everything! ( read about the project)
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