Noctua A12x25 to 135mm PSU fan adapter
thingiverse
Installing a 120mm Fan in a PSU with a 135mm Mounting Hole A simple adapter allows the Noctua A12x25 120mm fan to be installed in a power supply unit (PSU) designed for 135mm fans. The original design was found on Thingiverse, where it has been shared by users who have uploaded their designs under open-source licenses.
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