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adeek
Participant

Join Date: Mar 2008
Posts: 1

Duct calculating

03/24/2008 1:29 PM

I have a duct plan and there are 10 units with 1450 CFM and each unit have four diffuser and i am asked to install rectangular duct can u tell me how can i calculate the Width and Height (area) for the duct if u want i can send u the plan copy plz do explain me how it is done the area of my duct i will be waiting for your Ans.
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Anonymous Poster
#1

Re: Duct calculating

03/24/2008 11:18 PM

Please, send me the plans, sections, etc.

Alex London

apcco@verizon.net
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Anonymous Poster
#2
In reply to #1

Re: Duct calculating

03/25/2008 12:53 AM

Hi are you mechanical or electrical professional...

Please explain the duct calculating for me also..

my id is

malachidev@yahoo.com,

malachidev@dailythanthi.com...

I am electronics engg. working as a PCB designer...

thank and regards

Malachi devanbu
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Anonymous Poster
#4
In reply to #1

Re: Duct calculating

03/25/2008 4:28 AM

Please let me have a copy of your solution too.

Although, it will be better to post the whole problem and solution on the net for comments and opinions from more informed participants.

lerinfo2000@yahoo.co.uk
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Anonymous Poster
#6
In reply to #1

Re: Duct calculating

03/25/2008 8:45 AM

Hi Alex, nice to see your tendency in opening up with your informations..

It shall be even appreciable if you could post the methodology / calculation in the forum with an example or on the case what we have, could benice knowledge sharing..

hope to have positive response from you..

satibala_b@yahoo.com
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shirishrgandhi
Participant

Join Date: Mar 2008
Posts: 2
#3

Re: Duct calculating

03/25/2008 2:24 AM

Send me the plan
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Swellmel
Commentator
Hobbies - DIY Welding - New Member Hobbies - Car Customizing - New Member

Join Date: Jun 2006
Posts: 61
Good Answers: 1
#5

Re: Duct calculating

03/25/2008 7:10 AM

Have you used a Manual D? It should provide all the information needed.
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Anonymous Poster
#7

Re: Duct calculating

03/25/2008 7:43 PM

Sure pass me along the drawings and I will teach you how to calculate the system

regardss
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Anonymous Poster
#8
In reply to #7

Re: Duct calculating

03/27/2008 10:43 AM

hi, for your case u have a unit of 1450 cfm with four diffusers, so each diffuser outlet is 360cfm. coming to the duct sizing you shall consider the velocity and the space acailable above false ceiling for duct sizing.

if u go for exessive velocities, noise prolems will increase, so for optimum case and general applications we use 6m/s in mail ducts and 3-4m/s limiting velocity in branch ducting.

to avoid initial cost and working cost we can use maximum of 1:4 aspect ratio. however depending on site conditions we will go for higher aspect ratios.

Regards,

praveen.k

kpk_praveen2001@yahoo.co.in
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Anonymous Poster
#9

Re: Duct calculating

08/07/2009 1:46 AM

Hi everybody! can I also have the sample computation for the ducting design?. please help!. my e-mail add is eganjed@yahoo.com.ph

I would appreciate your kindness...

Thank you.
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Anonymous Poster (7); shirishrgandhi (1); Swellmel (1)

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