DYSON has unveiled its latest innovative fan, updating its notoriously noisy predecessor by using advanced acoustic engineering.

Dyson has spent three years and £40m on the Cool fan, the update to its premium £250 Air Multiplier bladeless fans. Engineers have added a ‘Helmholtz acoustic cavity’ that mutes sound waves and makes them 75% quieter than the previous generation.

“Air enters the Helmholtz cavity in the base of the fan increasing the air pressure within the cavity causing the sound energy to be dissipated and making the machine quieter,” explained Nick Schneider an acoustic engineer for Dyson talking to the Guardian.

Sweeter sounds

The Cool fan is not only quieter, but in a similar way to the improvements the company made to its AirBlade high velocity hand driers, which were incredibly loud when first launched, Dyson has tuned the sound so that it is much more acceptable to human ears.

“The cavity has been specifically designed with an exact geometry to target a frequency of sound at 1,000Hz, which people find especially irritating, making the sound quality – how it actually sounds in operation – much more pleasant too,” said Schneider.

The new Cool fan is the product of 65 engineers working over three years with £40m spent in research and development, managing to win the Noise Abatement Society’s Quiet Mark award for technology that makes modern life quieter and less noisy.

Like the Air Multiplier before it, the Cool fan hides a power-efficient electric motor in its base, which draws air in at high speed and fires it up into the main ring of the fan. The air is the projected as a constant channel of air towards the target, providing smoother cooling without the buffeting associated with regular fans.

‘Hundreds of incremental changes’

“At Dyson we make hundreds of incremental changes rather than one leap forward at a time,” said Schneider. “That means we produce and test hundreds of prototypes for each project. 640 prototypes from handmade models to 3D printed designs were made during the development of the Cool fan.”

The Cool fan is equipped with a nine-hour timer and different power levels, operating near silent according to Schneider, at low and medium power levels.

“They are extremely quiet and much more energy efficient compared to other fans,” said Schneider of the premium fans that cost upwards of £219.99 or around five to 10 times as much as simpler, standard bladed fans.

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