That's one hell of a fan for that tent. 6' x 6' x 6' will be well served by 340 CFM with a big ass filter. There are some variables to work into the equation. Also, your intake needs to be 1.5x your exhaust so a 6" exhaust needs a 9" passive intake.

Check my signature for a link to a discussion thread on grow room setup that includes calculations for sizing your fan needs.
bigsby Reviewed by bigsby on . New Grower. Will my setup work? Hey there. So I'm trying my first grow with 2 plants of Strawberry Cough. So far, Im thinking a 400 watt HPS light with air cooled reflector, a GrowLab 2'7" x 2'7" x 5'1", a 425-500 CFM inline fan w/ heat shield/sound muffler hooked up to a 6" x 16" PHAT carbon filter. I'm going to use a 3" passive intake. Does this sound like it will work? I plan on using soil. Any nutrient concentration recommendations? Also, how high do the HPS lights have to be from the plants, and can they be Rating: 5