Something like SilentBob linked to above would be perfect. It is pretty much exactly what I'm talking about, onlythose rads are twice as thick as I would propose. If those rads could be made single-pass and 150x150mm in size, and half as thick, then that would be perfect. They appear to be using ~12FPI like I mentioned, and the same sorts of tube numbers. I suspect that these guys made theirs for fans still slightly more powerful than the Papst FGL's though.
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