Intake and exhaust fan help

Hey RIU,

Before you send me to any links I have already read everything I could find and I'm still having trouble.

I'm having trouble with my new grow box i've designed. It's a 2x2x4 grow box with 6-8 CFLs. The problem is calculating the passive intake hole to accommodate the exhaust fans. I have 3 pc fans(5x5 in) that do about 45 cfm each. How many should I keep in the box and how large should I make my intake hole? Also does the intake have to be larger than the exhaust or can it be equal? Thanks for all the help
-RollingDope708

Only One Fan Needed. Equal Hole Opposite Bottom Side. Or If You Really Want Extra Movement For Your Own Piece Of Mind 2 Fans One Hole Equal To One Fan.

it would be nice to maintain a 1:2 ratio between your intake and exhaust.