The motor is supported on three little rubber feet to dampen noise and vibration- as these degrade and become weaker they can allow enough movement that the fan blades touch the inside of the casing - for mine, with the fan on at a constant speed it doesn’t touch, but as soon as I brake the weight of the motor overcomes the strength of the rubber feet and the fan touches the inside of the casing, making quite a racket.
I’ve heard of others using small bolts and rubber washers to mount the fan more securely but still maintain some noise and vibration damping- I’ll do something along those lines when I take it apart to fix in on the next month or so.
Cheers
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