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

This is an AMP page - Open full page! for all features.

Velocity Classification of Ventilation Ducts

Recommended air velocities in ventilation ducts

Sponsored Links

The duct velocity in air condition and ventilation systems should not exceed certain limits to avoid unnecessary noise generation and pressure drop in the duct work.

The limits of velocities depends on the actual application. The background noise in an industrial building is significant higher than the noise in a public building and more duct generated noise can be accepted.

Commonly accepted duct velocities are indicated in the table below.

ServiceVelocity
- v -
Public buildingsIndustrial plant
(m/s)(ft/min)(m/s)(ft/min)
Air intake from outside 2.5 - 4.5 500 - 900 5 - 6 1000 - 1200
Heater connection to fan 3.5 - 4.5 700 - 900 5 - 7 1000 - 1400
Main supply ducts 5.0 - 8.0 1000 - 1500 6 - 12 1200 - 2400
Branch supply ducts 2.5 - 3.0 500 - 600 4.5 - 9 900 - 1800
Supply registers and grilles 1.2 - 2.3 250 - 450 1.5 - 2.5 350 - 500
Low level supply registers 0.8 - 1.2 150 - 250
Main extract ducts 4.5 - 8.0 900 - 1500 6 - 12 1200 - 2400
Branch extract ducts 2.5 - 3.0 500 - 600 4.5 - 9 900 - 1800

Ducts are commonly classified as

  • Low Velocity Systems - with air velocities up to 2000 fpm (10 m/s)
  • Medium Velocity Systems - with air velocities in the range 2000 to 2500 fpm (10 - 13 m/s)
  • High Velocity Systems - with air velocities greater than 2500 fpm (> 13 m/s)
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

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 Extension Warehouse!

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.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

7 11

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more