The Dyson air purifiers are acoustically designed to follow the updated GBT standard. The machine is therefore engineered to be as quiet as possible, with streamlined air channels for reduced airflow turbulence. It has a high sound quality that produces a comfortable tone for the human ear without a compromise of performance. At minimum setting, the noise is almost inaudible to the human ear. All Dyson air purifiers are also ‘Quietmark’ certified.