The acoustical performance of the barrier shall be reported in the 1/3 octave band center frequencies. All test are to be done by an NVLAP accredited lab.
Noise Absorption: The panels shall have a noise reduction coefficient of 1.00 or greater according to ASTM Test Method C423-90a.
Sound Transmission: The panels shall have a sound transmission class of 30 or greater according to ASTM Test Method E90-90 and E413-87.
Acoustical Performance:
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