Wise Choice... Thick fans have higher static pressure. This is just as important as the 'CFM' rating. Airflow 'Cubit Feet per Min' is officially quoted with the fan suspended in free air. As soon as you put some resistance in the way, the airflow drops. If you had fitted a cheap PC chip-fan, it would have moved little air in that application. Papst are a good brand, and should be very reliable despite being sleeve bearing. For others, I can suggest taking a look at these (BALL Bearing) and cheaper: Adda DC Fan Ad0412 Lb c50 12v 40x40x20mm Ball Bearing Cooling Fan - though both on Back order at present!!