I was thinking to save A LOT of space, I could just cut a big rectangular hole in the top of my tower and mout my heatercore to either side of it. Then I could plug up all of the holes (there will still be some leakage) except for the fan holes and make them all blow out. This should create negative pressure in the case and make my heatercore the intake. Shouldn't be as good as a good shroud, but I'll be using the double fan "caprice" style heatercore.
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