Has anyone ever measured the decibel rating of their central shop vac? I'm looking for something that's as quiet as possible, suitable for using in a room in an apartment. Ideally, I'd be able to use it in the middle of the night without the neighbours banging on the door. I know that air flow is going to have it's own decibel rating. That's something I'd deal with after finding a suitable machine that's reasonably quiet from the get go.
Any suggestions would be appreciated.