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

Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - in imperial units ranging 10 000 - 400 000 cfm.

Friction loss (head loss) in standard air ducts:

air ductwork - head loss vs. air flow and duct diameter - cfm, in H2O, ftm Download and print Air Ductwork - Head Loss vs. Air Flow and Duct Diameter Chart 

The diagram is based on standard air 0.075 lb/ft3 in clean round galvanized metal ducts.

  • 1 inch water = 248.8 N/m2(Pa)= 0.0361 lb/in2 (psi) = 25.4 kg/m2 = 0.0739 in mercury
  • 1 ft3/min (cfm) = 1.7 m3/h = 0.47 l/s
  • 1 ft/min = 5.08x10-3 m/s
  • 1 inch = 25.4 mm = 2.54 cm = 0.0254 m = 0.08333 ft

Example - Friction Loss in Air Duct

Friction loss in a 60 inches duct with air flow 100,000 cfm can be estimated to approximately 0.4 inches water per 100 feet duct as shown in the diagram above. Air velocity can be estimated to approximately 5000 feet per minute.

Related Topics

  • Ventilation Systems

    Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Search

Search is the most efficient way to navigate 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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

This page can be cited as

  • The Engineering ToolBox (2008). Air Ducts - Friction Loss Diagram. [online] Available at: https://www.engineeringtoolbox.com/ductwork-friction-loss-d_1131.html [Accessed Day Month Year].

Modify the access date according your visit.

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!

Unit Converter

















































3.27.8

.