Corsair LL series fan noise?

My corsair LL series fan (positioned as the rear case fan) is making an audible sound. It's not super loud but not super quiet either. With CPU and GPU usage very low, the fan is audible. It has a kind of rickety sound. Is this a defect or normal? What should I do?

Thanks crew!
Reply to andrewnicholaskuzniecow
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More about corsair series fan noise
  1. If you set your fan to run at it's max speed (1500 RPM for 120mm and 1300 RPM for 140mm), does that noise go louder or disappear completely?
    Reply to Aeacus
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