For quiet operation, the “best” modern fan surpassing any Sone 166 vintage model would be something like the Panasonic WhisperCeiling series (0.3 sones at 110 CFM) or Broan’s Ultra Silent series (0.7 sones).

If you specifically need an original Sone 166 model — perhaps for a restoration or replacement — the best version would be the lowest sone rating with the highest CFM in that product line (check old spec sheets for “166-L” or “166-Q” suffixes, indicating low-noise design).


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