Rensair has 3 airflow settings: LOW, MEDIUM, HIGH. On the auto setting, it will automatically adjust according to the conditions in the room, increasing airflow when needed and reverting to LOW when conditions are back to normal. A. LOW setting = 50dB, a Rensair produces a low even white noise at 50dB, which is equivalent to the recommended white noise level limit for an infant sleep machine. B. MEDIUM setting = 60 dB, the equivalent to standard conversation noise level between two individuals. C. HIGH setting = 67 dB, which is fine for a lively place like a restaurant or pub with some background music present.