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Outside Noise

Which of the following acronyms expresses the level of continuous or ambient noise in indoor environments that is acceptable to the subject (receiver)?
A. STC, B. NR, C. PNC, D. NRC, E. INR



C. PNC=Preferred Noise Criteria is correct.
A.=Sound Transmission Class, B.NR=noise reduction, D.NRC=Noise Reduction Coefficient, E.INR=Impact Noise Rating is also known as Impact Isolation Class.
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