Originally Posted by
Mike Kramer
I can see a gap between the fan blades and the metal behind them.
Mike,
In the second photo, there originally was a charcoal filter covering the left side of the metal divider, the fan would then draw air in from the left side, through the charcoal filter, then recirculate it back out through the right side.
Not unlike recirculating kitchen fans which draw the air in from over the stove and recirculate it back into your face when you are standing there cooking. Another brilliant idea.