In a regular visit in a home, I noticed that there was a irregular noise out of the furnace in the utlity room, so I took a look and made a video. See

https://youtu.be/PORm-vU-iMY

After asked our maintenance staff check and fix the issue and here is what he shared. (see pics link below)

https://photos.app.goo.gl/x8S41gZkbA8PSZzy8

the diagnose by the maintenance staff is as this

 the cooling fan on the inducer fan motor was broken 

what is the cause, and how to prevent it from happening in the future?

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