Flex Duct Reduction

mwhiting0402 · 11-03-2007, 10:10 AM

I am installing AC in a home and need to use Flext Duct for some lines. What is the best method to go from one side to another. 10" main to 6" feeds and reducing from 10" to 8".

Do I just use normal Tees?

Chris Johnson · 11-03-2007, 11:45 AM

Duct work requires math, arbitrarly just putting on pipe is not always a good idea. you need to find someone to size the ducts you need. Not doing this can cause undue stress on a system by either too much back pressure or not enough and the system runs too long. There is a science to this. Consult a local HVAC designer for more assistance.

mwhiting0402 · 11-03-2007, 12:24 PM

Actually I have the sizes determined for both the supply and the return.
What I am looking for is how to run lines off one size flex duct (10") to another.
It seems odd to put sheet metal tees in each joint.
What is the best method to branch off or change size in a run?

Chris Johnson · 11-03-2007, 02:30 PM

Okay if you had it designed then you should be good to go, I hate to say it use a sheet metal Y to create your branches, it seems to be what everyone is doing.

11-03-2007, 10:10 AM	#1
mwhiting0402 Newbie Join Date: Nov 2007 Posts: 2	Flex Duct Reduction I am installing AC in a home and need to use Flext Duct for some lines. What is the best method to go from one side to another. 10" main to 6" feeds and reducing from 10" to 8". Do I just use normal Tees?

11-03-2007, 11:45 AM	#2
Chris Johnson ICF Construction Join Date: Oct 2007 Posts: 314	Flex Duct Reduction Duct work requires math, arbitrarly just putting on pipe is not always a good idea. you need to find someone to size the ducts you need. Not doing this can cause undue stress on a system by either too much back pressure or not enough and the system runs too long. There is a science to this. Consult a local HVAC designer for more assistance. __________________ Chris

11-03-2007, 12:24 PM	#3
mwhiting0402 Newbie Join Date: Nov 2007 Posts: 2	Flex Duct Reduction Actually I have the sizes determined for both the supply and the return. What I am looking for is how to run lines off one size flex duct (10") to another. It seems odd to put sheet metal tees in each joint. What is the best method to branch off or change size in a run?

11-03-2007, 02:30 PM	#4
Chris Johnson ICF Construction Join Date: Oct 2007 Posts: 314	Flex Duct Reduction Okay if you had it designed then you should be good to go, I hate to say it use a sheet metal Y to create your branches, it seems to be what everyone is doing. __________________ Chris

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Flex Duct Reduction