ok.. you can get away with using a bathroom fan hooked to the side of it.. they usually come with plugs on them, so install is a no brainer..
CFL works alright for flowering, if you have enough of them and you can keep it cool.. intake holes on one side of the box and a bathroom fan on the other will keep it plenty cool..
I have seen some people get phat ass buds using CFL.. I mean, real nice... If you are a grower on a real tight budget and you only want a few, than that would be the way to go... HPS is the best, but do some searching and you will find that CFL will give you impressive results..
there is guy on here named Humboldt, or something like that.. search for "100% CFL grow" or something to that effect, and you will see the amazing results he got, on a budget, with CFL..