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WebAttenuation in ducts with 25 mm lining are indicated below: Attenuation in ducts with 50 mm lining are indicated below: 1 in = 25.4 mm 1 ft = 0.3 m sound attenuation in unlined … Web29 jul. 2008 · With lined duct, the thicker the liner, the more effective the attenuation of low-frequency noise. ... see HVAC Sound and Vibration Manual, 2 Chapter 10 of HVAC Systems — Duct Design, 3 2005 ASHRAE Handbook — Fundamentals, 1 and Chapter 47 of 2007 ASHRAE Handbook — HVAC Applications. 4. REFERENCES. edgear of america
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