Very noisy KDK fan

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Bad bearings.
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Sounds like a gear in the oscillator gearbox is scraping or something

katthefanenthusiast
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Bearings need to changed. But usually these type of fan in public places aren't well maintained from what I've observed so don't really last that long compared to residential use.

diysg
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When the fire truck lost its siren and uses the wall fan:

CoinsCurrency-gc
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MAYBE FIXING FIRST KDK WALL FAN IT'S BROKEN

Evando-gn
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OMG its soo noisy but i think the grill is replaced

mrjumaatsamian
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This motor never see an engine oil... And always using without switching of for motor cooling is kill this guy

Nikolay