What level STC door do you suggest for an office building near an airport?

There are many variables that would determine the proper STC value, including the physical proximity of the office building to the airport. To ensure that the specification is properly developed, an acoustic consultant should be engaged to determine the Outdoor / Indoor Transmission Class (OITC) values.

STC ValueRatingDescription
50-60ExcellentLoud sounds heard faintly or not at all
40-50Very GoodLoud speech heard faintly, but not understood
35-40GoodLoud speech heard but hardly intelligible
30-35FairLoud speech understood fairly well
25-30PoorNormal speech understood easily and distinctly
20-25Very PoorLoud speech audible