Abstract
Acoustical consultants and noise control engineers regularly rely on the duct attenuation information in the American Society of Heating, Refrigerating, and Air-Conditioning Engineering (ASHRAE) Handbook. The handbook provides duct attenuation on a per length basis in octave bands for a set of standard duct cross-sections. However, acoustical consultants desire additional frequency resolution. Moreover, the handbook is limited to lining thicknesses of either 1 in (2.5 cm) or 2 in (5.1 cm). To fill in some of the gaps in the handbook information, the finite element method is used to determine the insertion loss of rectangular duct cross-sections with wide aspect ratios in 1/3-octave bands on a scaled down version.
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