Fan is definitely improtant. Fo sho.

400w HPS...60 sqft...465cfm might be a bit much, but it never hurts to get a really strong fan. With that being said, some people will recommend getting a 'dimmer' for your fan so you can buy a stronger one than you need and tune the fan down as you need it.

Another thought is what you are going to do with your extraction...? My suggestion, as I have seen it work decently well in more than one thread, IS...air-cool your light...and suck the rest of the air out of the cab THROUGH your light. If you don't understand what I mean, check out my thread or Splifted's thread. Our setups are the same pretty much.

I forgot what I was saying...

Oh...yea, I guess you would call it a 'half-cooltube' or something. This way you can get most of the heat out of your light to begin with (the whole point of cooltube) but also pull the stagnant air out of your room through the same fan.

Just my :twocents:

:rastasmoke: RastafarI

TGF