How much CFM?

[ftw2012]

hey Ya'll. im a first time grower and also a first post. my question is i have a 600 watt hps in a room thats about 50 cubic feet. about how many cfm of exhaust do i need to keep the room from over heating? Thanks in advance for any help!

 

[GanjaGuru]

First determine cubic feet of your growspace (l x w x height).

Get intake & exaust fans that match that in cf/m, although if you have a kick-ass exhaust fan you can get by with a passive intake.

 

[ftw2012]

would 270 cfm be considered kick-ass enough to just have a passive intake?