If you are really bothered by noise in a bedroom, Electrolux Pure A9/AEG AX9 is 17dB at it's lowest setting (goes up to 49dB at it's maximum speed as opposed to

If you are really bothered by noise in a bedroom, Electrolux Pure A9/AEG AX9 is 17dB at it's lowest setting (goes up to 49dB at it's maximum speed as opposed to IKEA's 60dB). But it's obviously not as cheap as the IKEA one.