Incorporation of General Industry Safety and Health Standards
https://www.osha.gov/laws-regs/federalregister/1993-06-30-2
Jun 30, 1993 · The complex sound wave in free space shall have a fundamental frequency (f sub(1)) between 450 and 500 hertz (Hz) modulated at a subsonic rate between 4 and 5 hertz. (ii) The signal generator shall not be less than 75 decibels at every location where an individual may be present whose immediate, rapid, and complete evacuation is essential. ...
DA: 86 PA: 73 MOZ Rank: 100