[wingnut60]

They are in exhaust direction--time will tell later if they draw most of the air from thru the lower grille and out the upper--the possibility exists that part of the air will be drawn in from the top opening of the grille they are mounted behind. T think they will work ok as any movement will help draw air upward.
The original ones were mounted about a foot below the upper grill in a horizontal plane, and all the air movement HAD to come from the lower grill.
Joe