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ANSI S3.1, American National Standard
Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms

  Ears Covered Ears Not Covered
Octave            
Band
Intervals
125 to
8000 Hz
250 to
8000 Hz
500 to
8000 Hz
125 to
8000 Hz
250 to
8000 Hz
500 to
8000 Hz
125 34.0 36.5 47.5 28.0 32.5 42.5
250 22.5 22.5 33.5 18.5 18.5 28.5
500 19.5 19.5 19.5 14.5 14.5 14.5
1000 26.5 26.5 26.5 14.0 14.0 14.0
2000 28.0 28.0 28.0 8.5 8.5 8.5
4000 34.5 34.5 34.5 9.0 9.0 9.0
8000 43.5 43.5 43.5 20.5 20.5 20.5