You are likely looking for the noise rating of a fan or range hood. Check the manufacturer's specs for the "Sone" rating to ensure it won't be too loud for your home.
From the Sones DB case, several enduring lessons emerge: sones db
: Sones are linear (2 sones is twice as loud as 1), whereas decibels are logarithmic (a 10 dB increase is a 10-fold increase in physical power). 1. Decibels: The Physics of Pressure You are likely looking for the noise rating