It would be like every 3 1/2 hrs thats enough? I guess the cooler itself has the fan as well.....
Well honestly there are hundreds of Cabinets sold that have no fans or anything and people use them without any issues. Fans are pretty much for the diehard to keep a constant RH throughout the entire humidor.
It doesn't take much to circulate the air. Most PC fans will circulate the entire cu/ft of the humidor in under a minute.