Most HVAC equipment generates sound. Even equipment with no moving parts can generate sound- think louvers with too much airflow through them whistling. Sound can be perceived as annoying or distracting. And in some cases, the sound our equipment will generate can even be harmful to our ears. Because of this there are sound compliance codes and Sound Engineers that design & analyze sound in systems. For these reasons and more it is important that we all know the basics of sound and how it is utilized so we effectively navigate this important aspect of equipment selection & compliance.