Quote Originally Posted by Ace-a-Rue View Post
aaaah! ...that would be ok outside of the case but inside, door closed you are just perpetuating more heat to be re-circulated.
That's the job of front and rear 120 x 38 mm fans. These fans will ramp up with increasing CPU temp. The goal is to achieve air circulation inside the case...front to back. Dead air pocket is BAD.

A case with a side vent will also significantly improve the cooling performance of a downward-firing CPU cooler. Room temperature air is ducted to the CPU cooler. This room air is at least 5 to 7C cooler than the case air. All else being constant, your CPU will run 3 to 4C cooler.