http://forums.procooling.com/vbb/sho...410#post137410
This is probably where you found it, samualt. Cathar mentioned that 16x16cm cores with a thickiness of about 5/8" to 3/4" are as close to "optimized" a hobbyist can get for low pressure (read: low spead) fans. I know you've seen this thread, bill.