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i'm not 100% sure of this but from my experience so far i'd say if you have to leave an opening, make a slim horizontal one. or several with a bigger distance in between than the height of the opening.
this is good, because at low speed one can have the required opening, but at speed the slim opening will "plug up" and the grill will appear as a solid form to the air
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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