Hikvision NVR Noise figures

Hi.

I have been looking at the Hikvision data sheets for NVR noise,specifically from the fans and so on . I cannot find any published dB figures for the NVRs.

Am I correct in this assumption ? I am considering replacing my DS-7608NI-K2 / 8P - it performs really well but the noise drives me up the wall. If necessary I'd consider a single network channel NVR and use a silent PPOE brick to cut out the need for the high power fan .

Basically - what's the quietest NVR I can get ...

Hikvision NVR Noise figures