The calculation for background noise level can be calculated by a mechanical engineer if they are familiar with the calculations or common software, such as the Trane Acoustics Program (TAP)—which costs $500 per license. ASHRAE has guidelines on run

The calculation for background noise level can be calculated by a mechanical engineer if they are familiar with the calculations or common software, such as the Trane Acoustics Program (TAP)—which costs $500 per license. ASHRAE has guidelines on running the calculations without software, but these are fairly detailed measurements and a consultant will most likely be needed.