RP-1408 — The Effect of Lining Length on the Insertion Loss of Acoustical Duct Liner in Sheet Metal Ductwork

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The objective of this research project was to quantify the attenuation of lined duct to improve our ability to predict attenuation in the design of new air distribution systems. Further to the objective, the data was analyzed to develop accessible equations and tables which can be readily published and used by the HVAC design community. This analysis was conducted by researchers at the University of Nevada, Las Vegas. The methods and results are described and provided in the following report.

Specifically, the objectives of this research project were to:

  1. Quantify the insertion loss of acoustically-lined ductwork over a wide range of duct crosssectional sizes and duct lengths with selected duct sound attenuation materials;
  2. Develop a methodology for predicting lined straight duct insertion losses based on the measured data;
  3. Obtain more reliable insertion loss values for frequencies below 250 Hz;
  4. Investigate the effects of elbow geometries and duct lining on elbow insertion loss of selected 90-degree, 24 in x 24 in (610 mm x 610 mm) duct elbows; and
  5. Investigate the effects of branch geometry and duct lining on the branch insertion loss of selected branch duct sizes and geometries in a 24 in x 24 in (610 mm x 610 mm) duct.

Product Details

Published:
2018
Number of Pages:
337
Units of Measure:
Dual
File Size:
1 file , 18 MB
Product Code(s):
D-RP-1408

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