Noise standard of screw silent air compressor

Quiet air compressors typically operate below 70 decibels, with ultra-quiet models reaching as low as 40-56 dB — about the noise level of a quiet library or rainfall.. Quiet air compressors typically operate below 70 decibels, with ultra-quiet models reaching as low as 40-56 dB — about the noise level of a quiet library or rainfall.. Most of the silent air compressors we supply typically have a noise level ranging from 40 dB to 60 dB. That's about as quiet as a library or a gentle breeze rustling through the leaves. But how do they achieve such low noise levels? There are a few key factors at play. [pdf]