Ok, and you use a passive intake?

And i got my fans from a ebay store.

Heres link to fan i got
6" INLINE AIR COOL REFLECTOR DUCT BOOSTER FAN VENT HEAT - eBay (item 200239804017 end time Jul-24-08 10:15:37 PDT)

Thanks for the help, hopefully you'll see my grow log starting soon!
InTheTrees Reviewed by InTheTrees on . ** Will this work?? Come quick, order on the way! ** Im growing in a homebox xs (2x2x4) and im growing buddha white dwarfs (From ) they will be under a 250w hps with a cooltube (from htpsupply?).. Well what im asking is would 1x intake 6'' inline fan pushing 250 CFM (cubic feet per minute), and i have 1x of the same 6'' fans on the cooltube.. Will another 6'' fan of the same one work?? Or would i need more?? Here is the specs of the fan.. And will i need 2x fans for my cooltube (One sucking in and out) or what?? PLEASE HELP ME! Heres specs Rating: 5