The noise control of cross-flow fans is very important, and the following technical measures are mainly used to control and reduce noise:

1. Optimize impeller design:

- Use low-noise impeller design, such as arc-shaped impellers, to reduce the interference between the impeller and the airflow and reduce the source of noise.

- Reasonably select the number of impeller blades and the circumferential speed of the impeller tip to reduce aerodynamic noise.

2. Sound insulation and noise reduction measures:

- Use soundproof covers or soundproof rooms to effectively block the noise generated by the fan during operation.

- Install silencers on the fan casing, such as sound-absorbing materials, diffusion chambers, etc., to absorb and attenuate noise.

3. Reasonable selection of motors:

- Use low-noise motors, such as permanent magnet synchronous motors, to significantly reduce the noise source of the motor itself.

- Use variable frequency speed regulation technology to adjust the motor speed according to actual working conditions, thereby reducing noise.

4. Operation and maintenance management:

- Regular inspection and maintenance to ensure that all parts of the fan are in good condition can avoid noise caused by wear.

- Reasonably adjust the working parameters of the fan to optimize its operating status and reduce noise.

In summary, through optimized design, sound insulation and noise reduction, reasonable selection of equipment and good maintenance management, the noise level of the crossflow fan can be effectively controlled to meet the noise requirements of various applications. These technical measures have been widely used in the manufacture and use of modern crossflow fans.