Fans - I need a new one. T6 vs. ?

As the title says - I'm ordering a new fan for my 4x4, probably today; but I have a couple questions first.

AC Infinity vs ? --- I'm looking at the T6, - anyone else using this unit? Other units that would work?
I'm thinking that the T6 would get me through a couple of grow room enclosure expansions.

6" --- Using AC Infinity's calculations, I need to move 257 cfm after factoring in my total cf, filter resistance & lighting heat.
Does this sound right?

Just wanting to make sure I'm on the right track.

I love my T6

I run it at like 2/3 pulling air from my 2x4 and 4x4 tents

Very quiet compared to my Hurricane brand fan

Thanks Bob!

Exactly what I was looking for.
Hopefully it gets here before the current fan quits - sounds like the impeller is out of balance.

I just bought one love it!!