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United Facilities Criteria CD 2
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> Table 7-3. Attenuation in Lined Ducts
Table 7-2. Approximate Natural Attenuation in Unlined Sheet-Metal Ducts
Procedure For Calculating Noise Control Requirements For An Air Distribution System
Noise and Vibration Control
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TM 5-805-4/AFJMAN 32-1090
Table
7-3.
Attenuation
in
Lined
Ducts.
7-6