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I love the case design and the thought you are putting into the airflow efficiency.



I agree with what you're saying here, but would the panel on the left layout not be vented?  Because if it is that will play a bigger roll than fan clearance alone.  But if the panel is not ventilated then I can see why you are going the route of layout on the right.



Its funny you should post this now, because I've just finished up writing an article this evening about this very subject!  Article is HERE.


My investigations tie up pretty close with what your theories and conclusions. 


Here is some of the data from the experiments, this first chart shows Wind Speed (km/h) of a few different fan sizes plotted at different distances from a flat surface on the intake side:



This chart shows the fan efficiency in percentage terms at a given distance from a flat surface: