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Old 03-07-2011, 09:19 PM   #1
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Attaching flexible duct to fexible duct


A home inspection revealed that there is a leak (up in the attic space) where a small trunk line of flexibile duct joins to a large flexible duct. I have tried to determine what the correct way to make this transition is, but I have not found this information.

What is the correct way to join a small trunk line of flexibile duct to a large flexbile duct?
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Old 03-08-2011, 03:55 AM   #2
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Attaching flexible duct to fexible duct


With a metal reducing fitting.
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Old 03-08-2011, 12:22 PM   #3
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Attaching flexible duct to fexible duct


The small line comes out at a 90 degree angle to the large line and the large line keeps going to feed the main ducts. So I am not adapting a large line to a small line. It is just a tap off to feed a room that was added on. How should these connect?

Last edited by dinotoad; 03-08-2011 at 12:24 PM.
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Old 03-08-2011, 12:25 PM   #4
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Attaching flexible duct to fexible duct


With a metal 90 degree T possibly in conjunction with a metal reducing fitting.
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Old 03-08-2011, 06:31 PM   #5
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Attaching flexible duct to fexible duct


With a metal wye to reduce resistance.
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Old 03-08-2011, 08:02 PM   #6
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Attaching flexible duct to fexible duct


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Originally Posted by dinotoad View Post
The small line comes out at a 90 degree angle to the large line and the large line keeps going to feed the main ducts. So I am not adapting a large line to a small line. It is just a tap off to feed a room that was added on. How should these connect?
Hmm..if it's a new add on and you're coming off of the main:

Airflow is going to be somewhat of a problem because you're adding area to your existing system which may make it undersized. Coming off at 90 degrees isn't good because you'll get straight blow thru to the main. Use a metal Wye.... if you insist on keeping the T, you just get your flex duct. pull the insulation over the T strap it down and silver tape it, then pull the insulation cover down and do the same. If you just want to attach flex to flex, get a metal connector and do the same
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