This is how a very efficient, silent air cleaner works > The filter makes the difference Down to the smallest particles How quiet is a whisper? Models and features
	You can barely hear Oxygen Air Cleaner even if you try - only 31 dB (A) in the bedroom mode. A modern fridge is at 40 dB (A) and a normal conversation is at 60-70 dB (A). In order to sleep with an air cleaner on a noise level under 37 dB(A) is recommended.