Dyson fan engineered for 'near silence'
Dyson is to launch a revised version of its Air Multiplier fan. The second generation Cool fan took three years, 65 engineers and £40million to create, but the British firm says it has acoustically re-engineered it for 'near silence'.
The bladeless fan includes a Helmholtz cavity in the base that mutes sound waves and makes them 75% quieter than the previous generation.
Air is drawn into a brushless motor near the fan's base, pushed out at speed through a gap in the fan's ring and then projected over an airfoil-shaped ramp.
Surrounding air is then drawn into the flow, expelling around 405litres of air every second.
Sir James Dyson said: "By reducing air turbulence and using ingenious, simple engineering principles like a Helmholtz cavity, Dyson engineers have targeted tones and reduced sound volume, making quiet fans with powerful airflow."
