Before diving into the "318 Verified" component, we must revisit the fundamentals. A is a unit of perceived loudness . Unlike decibels (dB), which measure physical sound pressure, sones measure how the human ear actually hears sound.
When you see the phrase it refers to a specific validation protocol originating from rigorous testing standards, often referenced within specifications by mechanical engineers or building codes like LEED v4, ASHRAE 62.2, or California Title 24. sone 318 verified