errr...i'm constructing a fan free solution for my CPU heatsink......there are only intake and exhaust fans but there are no CPU fan......hope it'll work fine as my proc is a barton running at 1.92Vcore.....



anyway, for a good airflow casing, first of all you need to identify which hardware in your PC is hot and does it require high airflow or not high airflow, direction of airflow(closely related to heatsink orientation) and how much airflow is needed...

* hotspot
* direction of airflow
* amount of airflow


the most common design flaw is the normal ATX version which the PSU is directly above the motherboard, as that location is probably the best spot for the exhaust to be located.....hence, adding a top fan will help, or by using a strong exhaust through the rear will help also.