Service Action to Prevent PSU Failures in ReadyNAS NV/NV+

There are some 140 mm fans that fit in 120 mm fan positions with adapters, and they can push equal air at lower rpm. See

http://www.frozencpu.com/products/2502/fan-201/AeroCool_140mm_Streamliner_Fan_w_120mm_Adaptor_-_SILVER.html?tl=g36c15s61

Maybe this same principle (using an adapter) can be used to add a larger, quieter fan to the Infrant NV/NV+?

Also, there are a lot of things that can improve noise for a given fan size: using a good fan design. See silentpc review as already suggested and http://quietpcusa.com/index.html. Also, minimize turbulence to reduce noise by making sure that there are no obstructions (grills etc.) within an inch of the fan's blades on the side that air come out of: this can be done using spacers if necessary (this is just one bit of info that I think I understand correctly from silentpcreview and elsewhere after months of searching to quiet my pc, not a thought original to me).