Hum noise when fan starts

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The HD90 is about 8 months old now. it is suspended from basement rafters and leveled. It has started to make a loud 'Hum' noise when the fan starts that can be heard throughout the house. Fortunately, the Hum stops after two seods but i am concerned it may get worse. Waht can be done to stop the noise? 

Asked on Aug 23, 2022 - 08:05:09am

We apologize for any inconvenience caused to you. Please open the machine shell and check whether the screws of the fan are loose and whether the wind wheel is contacted by foreign objects or wires. If there is no such situation, we think there should be a problem with the motor itself, and you can apply for a new fan.

Thank you for the very quick response!

To clarify, does 'machine shell' mean the central metal housing and/or the plastic end piece covering the back of the fan? 

Yes. If you have any questions, please feel free to contact us.

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