FANS do not cool. they only move air
you feel cool when a fans blows on you, because of one of two things.

1) you are warmer than the ambient air, so you lose heat to the air
2) you are wet and the water is evaporating in the air stream, you feel cooler
because you lose energy to let the water evaporate..

that is what sweating is designed to do

will it cool your humidor? NO

it is not warmer than ambient, and you don't want it to lose water from evaporation.

fan in a humidor, that is tightly closed, helps keep the top /bottom/front/ back temp and humidity even.

Never aim a fan at a humidor!!.