I have a 24 cubic ft true cooler and I dealt with this problem by going over board and picking up a bathroom ceiling fan at home depot and plugged it straight into a zoo-med rheostat for infinite control of the fan speed.
I point the fan towards the back of the incubator because of the heat tape on the sides. This won't be an issue this coming season as we are placing a false wall in the back of the incubator.
The heat tape will reside behind that false wall and the fan will mount to the wall and suck the air across the heat tape and out into the incubator.
The bonus of doing it this way is that there is no hot spots inside of the incubator since the heat tape is hidden behind the false wall.
I found that the fan on the bottom works better for these large upright incs
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