The lowest fan setting is relatively quiet, while the highest setting is the noisiest. The test results show that the air circulation fan with the lowest noise is the one with the lowest gear, thanks to the many gears of the DC motor, while the cooling fan is noisier. The highest-end fan with the smallest noise is the traditional fan. After years of improvement, most of these fans use multiple blades, which reduces the noise a lot. The highest-end fan with higher noise is still the cooling fan.

2024.03.20