How loud is a can fan?

Okay I think I'm gonna have to break down and get a can fan. With the new 400 watt HPS temps won't go below 90 F

My problem is that my neighbors closet is right behind my grow room closet How loud is a typical can fan? I found this one on HTG and it says its 52 db. I'm not sure what that equates to.

http://www.htgsupply.com/viewproduct.asp?productID=52583

Thanks

That is the same fan I use.

It sounded like a fucking jet the first time I turned it on - I had be hoping for really, really quiet. I built a box line with some foam to help cut down the noise.

Make sure you get a variable speed control. I only need to run mine about half speed.