Not Ranked
Over the louvers or WITH the grain (not my recommended flow direction) still sounds good, but at least 4 dBA's louder - this info from several customers who have done this & measured the noise. The small louver pattern I use does not impede the flow very much - look at the performance reported by Kinetic & that was before I made them with a clean & consistent 3" flowpath. The ones they tested necked-down to 2.5" at the entry & exit of the 3" core - I build them differently now. Performance stats on the current design would be much better so there would not be much loss at all.
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