Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Sound Attenuation in Duct Elbows

Noise attenuation in duct elbows are caused by reflected sound

Sponsored Links

Sound power level attenuation in an elbow is caused by sound reflection. It is only in larger ducts and at higher frequencies the attenuation is considerable.

Sound attenuation in duct elbows

Attenuation in lined and unlined ducts at different sizes and frequencies are indicated in the table below.

Attenuation(dB)
TypeWidth B
(mm)
Octave band center frequency (Hz)
125250500100020004000
Ducts Unlined 150 5 8 4
250 5 8 4 3
500 8 4 3 3
1000 5 8 4 3 3 3
Ducts Lined 150 1 7 16 18
250 1 7 16 18 16
500 1 5 16 18 16 17
1000 5 16 18 17 17 18

Example - Sound Attenuation in a Duct Elbow

The sound attenuation in an unlined 500 mm duct elbow at 500 Hz is

8 dB

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: acoustics sound ducts elbows attenuation ventilation
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2003). Sound Attenuation in Duct Elbows. [online] Available at: https://www.engineeringtoolbox.com/sound-attenuation-ducts-elbows-d_76.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

12 7

Sponsored Links
.