After a haitus, due to a particular functional change last year of the Noctua's 4020 fans, we've been working, along with support from our partner Enhance Electronics, to bring back Noctua into ENP-7660B-OVT and ENP-7660L-OVT. 

This then, will be a transition to a PWM Noc fan with the additional integration of a PWM controller that retains a closed loop thermal control within the power supply.

Due to the PSU PCB changes involved this will not be a user supplied and fit option. 

This will be an option on newly supplied applicable power supplies along with a retro fit service for existing units in the field.  

At the same time an optional inlet choke doping service will be offered. The aim of which is to assist in mitigating the natural phenomoma of choke resonance noise from occuring.