Solar Passive Window Box Heater Design change

I have been using a 4 solar fans to push the warm air back into the room.

I now think, using two solar fans will do the same job.

I currently have 4 opening, which may decrease the heat build up.
Redcing the top four openings to 2- could get my inside box heat to higher then the current 96f.

I plan to incorporate these changes over the weekend

Dave