A ceiling system with a cac 25 is considered low performance whereas one with cac of 35 or higher is high performance.
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A measure for rating the performance of a ceiling system as a barrier to airborne sound transmission through a common plenum between adjacent closed spaces.
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Nrc noise reduction coefficient is a standard measurement for a material s acoustical absorption ranging from 0 00 no absorption to 1 00 total absorption.
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Cac ceiling attenuation class is a standard measurement of a ceiling system s ability to block sound between two closed spaces cac values of 35 or greater are recommended to achieve speech privacy.