1. The coupling is not adjusted properly, resulting in misalignment.


2. The bearing is seriously damaged, causing vibration.


3. The impeller and casing are worn.


4. The anchor screws are loose or the grouting is not well filled or loose.


5. During operation, the dust content is relatively large or more, and it sticks to the blades.


6. After the impeller of the industrial high-temperature centrifugal fan wears out, an unbalanced component is generated.