View Full Version : Duct Design

29-04-2008, 12:49 PM
I was wondering if some1 has a simplified yet comprehensive e-book for duct design :confused:

29-04-2008, 06:29 PM
Hello pal.

Click HERE (http://www.ventaxia.co.uk/knowledge/handbook/system.pdf) for a starting point.
It takes you to Ventaxia (the fan manufacturers) website. The e-book in the link is a very good guide.


30-04-2008, 08:18 AM
wow thanks
very nice link
what is the static pressure relation with length/bends in a duct?

30-04-2008, 08:30 AM
All fittings in duct work as in piping have pressure drop equivelents to what is called straight duct or pipe
EX: say a 45* fitting would be say the equivelent of 25 feet of straight duct or pipe

30-04-2008, 09:22 AM
well all the link emphasises on circular duct
i think when u know the standards of velocities to be maintained on supply/exhaust diffusers and branch and main ducts then all that is left is mere calculator to ensure required cross sectional areas with length and height.

Can any1 give me a chart to elaborate what impact different bends(90*,45*0 have on static pressure?

30-04-2008, 06:20 PM
On the same site is another e-book, turn to page 10 (http://www.ventaxia.co.uk/knowledge/handbook/system.pdf). ;)

Happy reading