There is some level of fan curve, but it is loud enough that I can hear it almost everywhere in my 10,000 ft house. That being said its quiet enough that for most of the house its just white noise that is unnoticeable unless it is totally quiet. I sleep in the room right next to it and it does not stop me from sleeping too much. I could try to get some idea of db if you care enough. Its not terrible on the lowest fan settings. I have heard much worse, but its not great.