Oh! I thought it was a top-mounted fan! You're all set.
If the fan was top mounted, then the incoming air would have to turn 90 degrees, and that being right after the fan, is pretty bad for flow. Axial fans are pretty touchy that way.
I can't think of a way to optimize the air flow here: you're got it "spot on!". The M1A is a perfect choice. :shrug:
I'd consider using a blower, but I'm not sure that a 4" blower would outperform those M1A's either for flow or noise.
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