That fan will be more than sufficient. You will need a fan speed controller otherwise it will sound like an airplane testing hanger. Dialing down the speed to just want is needed will also add life to your carbon filter.

Concerning configuration, I'm going to point you to this thread where it is being discussed in parallel. Same exact issues. As you will see in this thread, the guy is going with a vertical hanging cool tube. Seems you could also go this route. Yields are significantly better. Have a look. You will get the answers to most of your questions. After you give that a read post your questions here so that you don't thread jack or at least pose you questions in a way that is relevant to his setup if you post in his thread.

Also, fan sizing is easy. There is a formula that you can plug in. Just look at the fan sizing sticky in my signature below.
bigsby Reviewed by bigsby on . Can I vent this? Hey so this is my first grow and i wanted to buy this Grow Tent and 400w HPS kit but i'm not quite sure how to set up the ventilation. is it ok if i just set up small cfm fans without ducting? i don't want heat to be an issue, but at the same time i want to keep it as cheap and simple as possible since the tent and light were pricey enough :) any help or tips appreciated! cheers Rating: 5