i see...

Fantech makes some great fans.. they dont make much noise either...

What ever they suggest, I suggest you go bigger.. If you have the $$ it is always best to get a GREAT exhaust fan..
I have used fantechs 2000cfm fan with a speed controller... and it was AMAZING!!!!!!!!!! SCARY actually.. LOL

http://www.fantech.net/inline_duct.htm

this is the FANTECH website.. I do not see the 2000 CFm fan.. but you dont need that fan anyway...

What are the dimensions of your room?

: )