Well... my thought is that with the cool tube arrangement, the heat escaping responsabilities of the exhaust diminish...
Since most of the heat never even enters the op, the exhaust flow doesn't need to be as great...
I dunno mate...
It's the only way I have done it... and I have never had issues...
My op is 10x12x8... I run 4x 600watts... and I use a 6" 440 cfm fan with a very restricting 40lbs carbon filter...
But I am a newb.. so don't take my word for it...
Cheers Bro...
And just so we are clear... I think it's 127% cool that you call it out....
RIU needs more people willing to call things out and asking for the facts.... and more people to not take offense to it...

Right on bro... people like you make RIU a better place to learn...
