That was my thought at first...do you think one fan sucking 30cfm out the top in the middle of the 6'x18" foot print would be enough to keep it dry in there. I would put maybe 4 1" holes on the back (not the sides).....heat is not an issue at all...its just at night it gets rather wet in there. I would probably have the fan come on after the lights are off....
Yeah I know buying the fans like I did are more costly...but when I get them they are done and wired and ready to go. They also came with the grating to cover the blades. On top of all that I got to use my work CC for the purchase so it didnt cost me anything