Hi

Could someone suggest some decent quiet POE network switches and NVRs.

I normally use netgear 48 port POE switches and Hikvision NVRs but they are both a bit too noisey for use in say a patch rack in a joinery cupboard in a residential property.

In the past ive used Ubiquity POE switches which are very quiet but i dont see the point of using them unless you also have a Ubiquity router and ive found the routers too buggy in the past.

Unless something was wrong with the Hik's fans, it will be tough to find an NVR quieter than that.

Might I suggest working on the other end of the problem. Line the cabinet with an open cell acoustic foam. I like using this: [Link: amazon.com]
It does a very good job at absorbing mid to high frequency noises in a cabinet (like fan noise).
Cover all the wall surfaces (including the backside of the doors) and cut out the openings for your cabinet fans and air inlets.

I’d also be concerned with conducted noise, but this is harder to suppress.