Again, I really appreciate the detailed responses. I already have 2x 70A relays in place, so I am just going to use them. No harm in having larger than needed relays. I'm mounting brackets to the shroud now, and then I'll be ready to wire it up and test it out.
I wish I was more knowledgeable in fluid dynamics, but I still dispute that 2x 2K CFM fans side by side move 4K CFM. My intuition says that doesn't add up.
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