what size fan (cfm) do i need for a 2x4x6 closet grow?

[d reefnugs]

looking to start an indoor grow. i have a 2x4x6 tent that i will put in my closet but im not sure how big of a fan to get. i dont have any lights yet but im leaning towards a 400 watt air cooled hps/mh combo light.

how big of a fan would i need? would a squirrel cage fan (260cfm) work? is it too big?

 

[Granger2]

2x4=8 x6=48 cu ft, call it 50 cu ft. Get a 4" centrifugal fan, and a Phresh filter 4x12. A speed controller would be good just in case. Good luck. -granger