Edit: Noise level. It's pretty quiet. The camera/mic was two feet from the machine in the video. The fan runs constantly, but it's unobtrusive. I don't even notice it most of the time. I'd guess 5-6 db above ambient. That is a guess, I can't measure it.
As trivial as the actual db rating is, if you have or know someone with a smart phone there are a bunch of free apps that will measure the sound level.