A True Review has the details on the AcoustiFan No Dust fan kit. Their packages included the usual fan which has been modified with a sheeth around the motor hub to prevent dust from making its way in, silicone gaskets to reduce vibration, and an assortment of power cables. A nice package if continuous use over many years is of concern but an expensive proposition for the majority of PCs.
AcoustiFan No Dust Kit Reviewed
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