Ducting air can be very effective at managing airflow/noise/heat dissipation. The problem lies in the fact that most ducting is unique to each case and radiator placement within the case. Cath's goal was build a radiator optimized for any placement within a case with certain perameters regarding noise and heat dissipation.
edit: you have a point though, slicey. When properly implemented, ducting can provide high airflow with minimal noise (think of the a/c system in a house). The problem lies in mass integration.
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