Yep to that said above by NeonSamurai. Airflow all in the same direction such as in the front and out the back. Why would you want dust blown out the front of your case.
My Antec P182 case has one front mounted 120mm fan sucking in air from the base of the upper chamber while at the rear top and rear roof I have two 120mm fans sucking hot air out. And the less clutter and cables in the way maes for better case airflow from the front and out the back. 
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