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

Ventilation Dampers - Classification

Dampers in ventilation systems may be classified through function, construction or leakage class.

Sponsored Links

ventilation damper

Classification by Function

Dampers may be classified according their functional tasks in the ventilation system:

  • adjustment
  • closing, running
  • closing, smoke
  • closing, fire
  • overpressure
  • modulating

Classification by Construction

  • plates
  • membranes

Classification by Leakage Class

  • based on BS EN 1751:1999

The leakage class determines the acceptable air leakage through the damper with a 100 Pa pressure difference.

  • class 0 - No requirements
  • class 1 - less than 0.2 m3/s per m2 valve area
  • class 2 - less than 0.04 m3/s per m2 valve area
  • class 3 - less than 0.008 m3/s per m2 valve area
  • class 4 - less than 0.0015 m3/s per m2 valve area

The air flow rates through the dampers at 100 Pa are in general available from the manufacturers catalogs.

FunctionClass
1 2 3
Adjustment x
Closing, running x
Closing, smoke x
Closing, fire x
Overpressure x
Modulation x

Calculating Leakage Air Flow Rate through a Closed Damper

The leakage air flow through a closed damper can be calculated if the the difference pressure through the damper and the leakage air flow rate at 100 Pa (manufacturer data) through the damper is known:

ql = q100 (dpl / 100)1/2                           (1)

where

ql = actual volume flow per m2 valve area (m3/s / m2)

q100 = volume flow at 100 Pa per m2 valve area (m3/s / m2)

dpl = actual pressure drop through the valve (Pa)

Sponsored Links

Related Topics

Related Documents

Sponsored Links

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
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). Ventilation Dampers - Classification. [online] Available at: https://www.engineeringtoolbox.com/ventilation-dampers-d_203.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

3 10

Sponsored Links
.