its a brushles dc motor the coil controls are on a printed circuit board behind the hub. maybe if you serched the manufactures web site you could find one but i dont think so.

Questions & Answers: SilverStone Air Penetrator AP121-L AP121-WL White LED Case Fan

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SilverStone Air Penetrator AP121-L AP121-WL White LED Case Fan

1500 RPM 35.36 CFM
Fluid Dynamic
22.4 dBA

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