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Cinematography. Background acoustic noise levels in the theatres, review rooms and dubbing rooms Ingestion-build-228203 for new pneumatic tyres designed1 Scope This International Standard specifies measurement methods and maximum ratings for indoor background sound pressure levels in theatres, review rooms and dubbing rooms. It applies to noise emitted by heating, ventilating and air conditioning systems, intrusive noise from the projector(s) associated with the theatre and noise emitted by any other mechanical or electrical equipment in the theatre building. It is intended for application when the