www.tjernlund.com/Retail/fans.htm The fan is 530 cfm. The model # M-6.
I have used the CAP, Valueline, fans in the past. This fan is much stronger and much quieter.
I also added a speed controller to it for less than $20 from Harbor freight. They call it a router speed controller, but it is the exact same controller the grow shops sell for much more.
If your interested, Email them with a competitors fan, such as the valueline 465 cfm fan, and the web site selling it. They will match the price. I got mine for $90 shipped. Hope it's what your looking for.