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IIRC BillA (of Swiftech and CoolingWorks) did an article on why using the shell of a fan as a shroud is actually worse than no shroud at all. I think it's due to how the fan's housing is shaped, how it funnels down in the middle.Arcygenical said:You really shouldn't need a shroud...
you can use the shell of a 120mm fan, in it's place.
One school of thought is that there is a dead air space at the center hub of a fan. Therefore the portion of the radiator in front of the fan's center hub gets no air flow. If a shroud is used to separate the fan and the radiator by just a couple of centimeters, then all of the radiator's surfaces will receive air flow. I believe that the same rationale applies to the corners of the radiator.annaconda said:Why do you need these? To seal air leakage.![]()