Division 22 23 Ebook Page 26 Acoustics in the Classroom Brochure

Bare Sheet Metal Wrapped Sheet Metal Lined Sheet Metal Fiber Glass Duct Board OCTAVE BAND FREQUENCY (Hz) 125 250 500 1000 2000 4000 DUCT NOISE INSERTION LOSS (dB/L) 1 2 3 4 5 .1 .5 No perceived noise reduction Significant perceived noise reduction (1" thick) Very significant reduction. Perceived noise reduced up to 97% on 10ft. ductwork at 2000Hz. No perceived noise reduction

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