Note: this thread is not about an actual hardware problem, my system works fine. If you are looking to be helpful to people in actual distress, this is the wrong thread.
Here is my build if relevant http://pcpartpicker.com/p/2nPTRB (it is different from last time I posted it due to including some stuff that was added from last computer and some new stuff I ordered and installed)
When I first built this rig, I assumed that my PSU fan should face downward in the bottom of my computer case. My case has a grill at the pertinent spot, and came with a pad for the explicit purpose of acting as a filter for a PSU fan. The case stands approx 1/2" from the wood surface of the nook in which it resides (I know that bottom intake fans don't work when the case is flush with the surface which supports it).
I thought everything was good. However, I have since seen multiple internet posters express the view that the PSU fan should always be on the inside of the case. Did I do it wrong? Are my computer components going to suffer for it?