Expected yield

My current airflow setup includes 20" box fan exhaust and 10" box fan intake and I'm hoping that will be enough, what do you think? The only downside is that this setup creates negative pressure but that was and is still the least of my concerns at the moment

have you done some basic research or did you just jump into growing? you want negative pressure in that room-do you have a carbon filter for the smell? you'll be able to exhaust some of your heat that way too.
aside: i think CFLs needed to be on their side for the best light to the plant.

TJ baba said:

Is that ballast loud? I would buy it for sure if it's got a quiet ballast. My other digital 400w ballast was too loud

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most new ballasts font have fans so go with em..I use a lumatek n not a sound from her

theslipperbandit said:

most new ballasts font have fans so go with em..I use a lumatek n not a sound from her

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I think lumatek is a bit more expensive, and they don't sell a kit with lumatek, everything would be purchased separately. But if the ballast I receive is too loud I will send it back and probably get a lumatek.
This is my first grow and I have dealt with problems as they arise along the way, so everything I have is not set in stone.