Sure. (BIP, too).
I'd always thought it had to do with them being designed for different air velocities and temp differentials.
I'd assumed they were trying to introduce turbulence to ensure all air molecules had a chance to have some heat transfered to them (same reason they tend to be 2" or 2.5" thick) and that the issue was making sure that the heat transferred to the air did not drop as air velocity increased.
No science behind this - just assumptions from what little I know about airflow.
Might be worth adding passive cooling while we're at it.
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