High quality AC fans need to have the following characteristics:

1. stable operation effect: high-quality AC fans need to have a good balance system, which can ensure the stable operation of the fan, without shaking or vibration.

2. efficient heat dissipation: high-quality AC fans need to have efficient heat dissipation performance, can quickly dissipate the heat generated by the equipment to ensure the normal operation of the equipment.

3. long life: high-quality AC fans need to have a long life, general ball bearing fan life of 50,000 hours, oil bearing fan life of 250,000 hours, to ensure the long-term use of equipment.

4. low noise: high-quality AC fans need to have low noise, will not interfere with the normal operation of the equipment, but also does not produce noise pollution of the surrounding environment.

5. Easy to maintain: high quality AC fans need to be easy to maintain, can be easily cleaned and maintained to extend the service life.

6. High-quality materials: high-quality AC fans need to be made of high-quality materials, such as aluminium alloy, stainless steel, etc., to ensure the durability and stability of the equipment.

7. Intelligent control: high-quality AC fans need to have intelligent control, which can be controlled remotely through mobile phones or computers for the convenience of users.

These are some of the characteristics of high-quality AC fans, users can choose the right AC fan according to their needs and budget.