Dyson bladeless fans, though they have no visible fan blades, have small blades hidden in the base that pull air from the outside and force it through narrow openings around the upper ring. This moving air creates a low-pressure system that causes an air current to move through the opening, multiplying the effect of the air moving through the base.
The Dyson fan uses a brushless motor to reduce noise while turning nine blades to pull over 5 gallons of air through the device every second. This air speed is equivalent to the air movement through Dyson's vacuum cleaner, and the device multiplies the volume of air moving through the fan 15 times.
While the first Dyson fans were effective at moving air, most consumers considered them noisy, even though the manufacturer attempted to reduce the motor noise. Dyson spent more than $60 million to create the second version of the fan with a reduced noise factor. Sixty-five engineers worked on the project using cameras, smoke and fluorescent paint to determine where vibrations were causing the unit to create noise. The newer model uses hollow cavities that make changes to the range of the sound, moving it out of the region most humans consider most annoying.