10.14 noise reduction coefficient. Arithmetic mean of sound absorption coefficients at 250, 500, 1000, and 2000 Hz, rounded to the nearest 0.05 metric sabin per square meter. Abbreviation, NRC.
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10.14 noise reduction coefficient. Arithmetic mean of sound absorption coefficients at 250, 500, 1000, and 2000 Hz, rounded to the nearest 0.05 metric sabin per square meter. Abbreviation, NRC.
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