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808.2.1 Performance Method
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For each of the octave frequency bands with center frequencies of 500, 1000, and 2000 Hz, the reverberation time (T60) shall not exceed the times specified below:
- 0.6 seconds in classrooms with volumes up to and including 10,000 cubic feet (285 m3).
- 0.7 seconds in classrooms with volumes of more than 10,000 cubic feet (285 m3), but less than 20,000 cubic feet (566 m3).
Reverberation times shall apply to fully-furnished, unoccupied classrooms. Reverberation times shall be field verified via measurements over a minimum 20 dB decay in each octave frequency band in accordance with ASTM E2235 listed in Section 106.2.13.
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