The noise generated by fans during operation mainly comes from three categories: mechanical vibration, air disturbance, and part wear. Understanding the causes of noise and taking targeted measures can effectively reduce noise and improve user experience. Mechanical vibration is the most common source of noise: components such as the fan's motor, blades, and base will generate vibration during operation. If the components are not installed firmly (such as loose blade fixing screws, untightened base screws), the vibration will intensify, producing resonance noise; in addition, worn motor bearings and eccentric rotating shafts can also lead to increased vibration, which is manifested as a "buzzing" or "clucking" sound during operation.​

Noise generated by air disturbance is related to blade design and wind speed: when the blades rotate, they cut the air. If the blade angle is too large, the edges are not smooth, or there are burrs, it will cause disordered air flow and produce "whooshing" wind noise; the higher the wind speed, the greater the impact force between the air and the blades, and the noise will increase accordingly. The unreasonable design of the protection net of some fans (such as too small mesh holes and too dense mesh wires) will also hinder air flow and generate air flow noise. In addition, if the fan is placed on an uneven surface, the base will shake during operation, which will also produce additional noise due to friction with the ground.​

Part wear or aging is also an important reason for increased noise: after long-term use, the insulation layer of the coil inside the motor may age, leading to unstable current during motor operation and generating electromagnetic noise; aging and deformation of blade materials (such as cracks and bends in plastic blades) will cause the center of gravity to shift during rotation, intensify vibration, and increase noise; when the motor bearing is short of oil, the friction between internal parts increases, making a harsh "squeaking" sound.​

Noise reduction methods for different reasons: First, check and reinforce component connections: regularly tighten the fixing screws of blades, base, and protection net to ensure all components are firmly installed, reducing vibration noise; if the blades are deformed, replace them with blades of the same specification in time to avoid center of gravity deviation. Secondly, optimize the contact between blades and air: clean the dust and debris on the blade surface to keep the blades smooth and reduce air disturbance; choose fans with rounded blade edges and reasonable angles, or reduce wind speed during use to reduce air flow noise.​

For motor maintenance: regularly add lubricating oil (such as sewing machine oil, special motor lubricating oil) to the motor bearings to reduce part friction and mechanical noise; if the motor bearings are severely worn, replace them; if the motor produces electromagnetic noise, it may be a coil fault, and it is recommended to contact professionals for inspection and repair. In addition, improve the use environment: place the fan on a stable and soft surface (such as a carpeted floor) to reduce friction and vibration between the base and the ground; avoid placing the fan near hard objects such as walls and furniture to prevent noise reflection and amplification; place a rubber pad or shockproof pad between the fan base and the ground to absorb vibration energy and reduce noise transmission.