OP here. Like always appreciate the feedback. I should have mentioned that I did fill space with a bat of insulation that ends at the edge of the fridge. So, there is no dead air space. As for the heat dissipating from the fins; I agree that the lower board directed the fan across it. But I have a hard time seeing that a fan in a enclosed space is more effective than a fan that is still focused on the fins with more access to air flow. The fan is still 6-7 inches below the edge of the board, so I don't feel like the air flow or direction was really affected. But I'm always open to you guys with the positive feedback and directions.