Why such a small space? Trying to hide it from mom and dad? This is a grown up sport. Sorry if I am off base and you are adult and on your own but usually PC growers are children.
Kali's advice is sound.
yea perfect for vegging if your in ultra stealh mode, but where do you flower these 3 plants?^^ wrong.
Im on my own, and i have a PC veg box. A statement like your's sounds like it WOULD come from a child...
The space is perfect to veg about 2-3 plants. You will want to use CFL's. A 70w HPS will get that box very hot and it will take up most of the space. My box gets hot to the touch with just 3 CFL's.
I have 1 exhaust and passive intake and the temps are just fine. I say go for it. there is a thread dedicated to PC grow cases on ICmag.com Check it out!