how loud is a typical 87-107 cfm fan?

Hey, I'm ordering this grow box for $100 and the guy described the fan as "not one of those quiet computer fans. It is rated 87-107 cfm." But he didn't have a sound rating. Anyone know how loud a typical fan like that is? I want it to be kind of stealthy. Thanks!

If it's an 87-107cfm computer fan it will probably be loud. If it's an 87-107 in-line duct fan or extractor fan, it will be quiet, but not very effective. I have a 250cfm inline duct fan that vents my air cooled reflector and it's silent except for the whoosh of air passing through.

What are the dimensions?