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[MrToad]

Vapor said not to stack fans directly unless they are counter rotating... I don't remember him saying anything about "stacking" fans with a radiator between them.

The reason you shouldn't stack fans directly is because when air exits a fan, it's like a tornado... it has a twist to it. The counter rotating fans cut this twist to increase CFM. The radiator between your "stacked" fans cuts the twist too.

I distinctively remember that detail... mainly because until Marci mentioned it, I had never heard about counter-rotating fans...

It's an idea I toyed with until, to confirm his words, wasn't able to find any 12V counter-rotating fan, only 220V ones, which added and unwanted layer of difficulty to my build...

Edit: Found it!

http://www.xtremesystems.org/forums/....php?t=156119&