Grow Tent Ventilation Questions

I am planning on purchasing this 4' x 2' x 5' grow tent from ebay. It will be going inside my closet in my AC bedroom.

http://cgi.ebay.com/NEW-REFLECTIVE-INTERIOR-GROW-TENT-CABINET-HYDROPONICS-R_W0QQitemZ300394417400QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item45f0e70cf8

I will also be buying a 400w hps/mh light from htgsupply.

I was wondering what CFM fan I would need to keep the tent between 72 and 76 degrees?

My plan was to buy a few fans from http://www.airboosterfans.com/duct-fan.html

I was going to get one AF-8(with 8 to 6 reducer) rated at 420CFM free air, and one AF-6(with 6 to 4 reducer) rated at 240 CFM free air.

The AF8 will be for exhaust and the AF6 for intake.

What do you guys think of this setup? Will it keep my tent cool?
 
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