Passive intake for grow tent?

Hello
I am using a secret Jardin Darkroom tent size 32" x 32" x 63":
http://www.greners.com/secret-jardin-dark-room-grow-tent-dr80.html?___store=english

My light is a 400W Cooltube with 4" ducting.

I have a Growbright 4" inline fan:
http://www.htgsupply.com/viewproduct.asp?productID=52531

It has a filter on it for exhaust and a clip on fan in the tent for air movement.

My question is do I need a fan for intake or would a passive intake duct be enough?

Any help is appreciated.

Passive is fine. Best to get air from outside. After the filter you will be moving about 90 cfm.
It would be best to have one fan for the light and a second for exhaust mostly while they are young because the fan will suck all the humidity out of the tent. It works well during flower though, the one fan for everything. Another thing, it’s going to get hot in there. Run your lights at night and get about 5° cooler.

Awesome feedback.
Thanks Cruzer.
I will be running my lights at night.
I'm hoping its not too loud because I sleep close to the tent.
Otherwise I'll have to crank up my AC as well.