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kovlad
Participant

Join Date: Jul 2008
Posts: 2

Perforated duct design

07/14/2008 10:28 AM

I have to distribute 90, 000 CFM of make up air with 3 duct branches (30,000 CFM each). One option of a distribution system is perforated metal duct. My concern is how to control and calculate equal distribution of air along the duct. What minimum and maximum velocity can be?

Thank you in advance for respond.
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philiplyon
Associate

Join Date: May 2007
Posts: 45
#1

Re: Perforated duct design

07/14/2008 10:53 PM

Without the use of ballancing controls, you should keep the three ducts equal in size and length and perforations. Use 800 to 1000 Feet per minute velocity and you wont be far wrong. Good luck

Phil
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Anonymous Poster
#2
In reply to #1

Re: Perforated duct design

07/15/2008 1:44 AM

Thank you Phil!

There is another issue, supply ducts are 8000 mm above the exhaust source, therefore I thought to use 1500 FPM.
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Ried
Guru

Join Date: Dec 2005
Posts: 1602
Good Answers: 19
#3

Re: Perforated duct design

07/15/2008 9:33 AM

Visit www.mcgillairflow.com. They sell perf metal duct, will offer some engineering help and have some design guides available to help you layout the system.

__________________
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kovlad
Participant

Join Date: Jul 2008
Posts: 2
#4
In reply to #3

Re: Perforated duct design

07/15/2008 9:58 AM

Thank you Ried!

I contacted them last week and during waiting for respond was trying to get more information for advance.

This morning I have received calculation from them and I am going to call them to discuss details.

Best regards

P.S. They have done calculations based on 1500 and 1250 FPM (about 6 sections).
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