If the resulting dBA matches the Sone-based expectation within ±2 dB for a given product category, your conversion is “verified.” If not, you have uncovered a mismatch: either the Sone rating was measured under different conditions (e.g., free-field vs. reverberant) or the frequency spectrum has changed (e.g., duct-mounted vs. open inlet).
There is no single fixed formula for converting sones to dBA because they measure different things (perceived loudness vs. sound pressure), but industry standards provide reliable approximations. Generally, 1 sone is equal to 28 dBA . sone to dba verified
. Anything above 4.0 sones will likely require you to raise your voice to be heard over it. specific appliance recommendation based on these noise levels? If the resulting dBA matches the Sone-based expectation