The noise reduction coefficient is the arithmetic average rounded to the nearest multiple of 0 05 of the absorption coefficients for a specific material and mounting condition determined at the octave band center frequencies of 250 500 1000 and 2000 hz. Thinner loop and cut pile carpets require a more. For most residential carpets the carpet pad should be between 1 4 and 7 16 inch thick and should have a density of 6 to 8 pounds per cubic foot.
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