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Sound Transmission through Duct Walls

Estimating sound transmission from ducts to surrounding rooms

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Sound transmission through duct walls

Sound or noise transmitted from the inside of a duct to the surrounding room can be expressed as:

Lp = LN - TL - 10 log (A F / 4 Ad)                                 (1)

where

Lp = sound pressure in room (dB)

LN = sound power level in the duct (dB)

TL = transmission loss through duct wall (dB)

A = room absorption (m2 sabine)

F = cross section area of duct (m2)

Ad = surface area of duct (m2)

Typical sound transmission loss through duct walls are indicated in the table below:

Attenuation - TL - (dB)
Duct sheet
thickness
(mm)
Frequency (Hz)
1252505001000
1.25 17 22 25 29
1.0 15 20 23 27
0.75 14 19 22 26
0.65 12 17 20 24
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