The following data has been cross-referenced against ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) handbooks and major fan manufacturer datasheets.
Here’s a concise, verified technical write-up on the relationship between (perceived loudness) and dB(A) (A-weighted sound pressure level). sone to dba verified
A: Using the reverse formula: 10^((80-35)/22.275) = 10^(45/22.275) = 10^2.02 = ~105 sones . (This is why vacuums feel 100x louder than a quiet fan.) The following data has been cross-referenced against ASHRAE