What are some ways to determine whether a centrifugal fan is faulty?

Here are some ways to determine whether a centrifugal fan is faulty:
Judging from appearance and sound
Appearance inspection
Check whether the impeller is obviously deformed, damaged or corroded. For example, if the impeller blades are bent or broken, it will directly affect the performance of the fan.
Check whether the casing has cracks or damage, especially around the connection parts and the air outlet and air inlet.
Observe whether the fan's mounting screws are loose. If the screws are loose, the fan may vibrate or shift during operation.
Listen to the sound
A normally operating centrifugal fan has a steady and regular sound. If there is abnormal noise, such as a sharp whistle, a dull roar, or a periodic impact, it may mean that there is a fault. For example, the friction between the impeller and the casing will produce a harsh sound; bearing damage may cause a buzzing or clicking sound.
Judging from the running state
Starting condition
Pay attention to whether the fan starts smoothly. If it is difficult to start, such as requiring multiple attempts to start, or the motor has obvious jitters when starting, it may be a problem with the motor or capacitor.
Speed ​​condition
You can use a speed measurement tool (such as a tachometer) to detect the actual speed of the fan. If the speed is significantly lower than the rated speed, it may be caused by motor failure, insufficient power supply voltage or transmission component slippage.
Observe the stability of the speed. Unstable speed may be caused by power fluctuations, motor failure or control system problems.
Judging from the ventilation effect
Air volume detection
Use an anemometer to measure the wind speed at the fan outlet, and then calculate the air volume based on the area of ​​the outlet. If the air volume is significantly less than the normal range, it may be caused by impeller blockage, excessive gap between the impeller and the casing, or insufficient motor power.
Wind pressure test
For some ventilation systems that require wind pressure, a pressure gauge can be used to measure the pressure difference between the fan inlet and outlet. If the pressure difference is too small, it may be caused by factors such as unreasonable impeller design, impeller wear or increased system resistance.
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