MacBook Pro 15" Retina Display Mid 2012 Teardown

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The next piece out is the processor and GPU heat sink and exhaust air vent assembly.
By pushing the air through a restriction before it gets to the outermost vents, you introduce an additional pressure drop (due to fluid shear stress at the walls) that accelerates the air and pushes it out of the computer faster.
With that last obstacle out of the way, the logic board comes out fairly effortlessly.

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