I'm in the process of setting up my grow closet. I will have a 150w hps and a 4-6 cfls the space is about 3x3x8 will I need air venting outside or air coming from outside or will fans on the plants work?
hmm in that case ill add a bathroom fan to the ceiling of the closet to vent out, any suggestions on how to bring clean air into the closet
not a bathroom fan, you need an inline fan for sufficient air exchange. you also want to invest in a carbon scrubber to keep odor under control. once you have a decent extraction fan, that will pull fresh air into your space through cracks or an intake hole.