The number one complain of the previous generation of Dyson Cool fans is the noise it produces and I am happy to hear (pun unintended) that the updated fans are now up to 75% quieter while maintaining the same powerful airflow. Besides being quieter, there is also a new sleep timer being added to the fan.
The core of Dyson Cool fan is the Air Multiplier. Air is drawn in by an energy-efficient, brushless motor. Airflow is then accelerated through an annular aperture, passing over an air foil-shaped ramp, which draws in and channels its direction. This creates and projects powerful, smooth and high velocity airflow.
The new Air Multiplier which gives it up to 75% quieter is the work of 65 Dyson’s engineers. They reduced the turbulence of high velocity air and cancelled out specific tones. To eliminate tones of 1,000Hz (similar to the frequency of the noise produced by the wing beat of mosquitoes), a Helmholtz cavity is added to the base of the machine to dissipates sound waves.
For the previous generation fans, the loop thickness is the same throughout. But for the updated fans, they create a larger space at the loop base and that reduces airflow obstructions meaning less turbulence and therefore less noise.