Anyone that has a Spike pinball machine knows that the fan in both the 300W and 500W power supply they use is too loud, especially in a home environment.

This fan kit is designed to replace the stock 34.6dB fan in Stern Spike power supplies to make it almost silent. This replacement 12.8dB fan has less CFM (airflow) than the Stern one, but the practical difference is that just means the fan runs longer to drop the temp back down to ~104F or less once the temperature in the power supply turns it on. In testing with this fan installed on multiple machines, the RSP-500-48 power supply never exceeded ~122F (the power supply critical shutdown threshold is ~158F), however, all possible pinball machine configurations cannot be known, so you are installing this kit at your own risk.
THIS KIT IS NOT FOR SPIKE 2 MACHINES.