Combine 2 ducts into one

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Old 11-21-10, 02:13 AM
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Combine 2 ducts into one

Planning on finishing a basement and am trying to save space so I only have to frame 1 ductwork instead of 2(and of course to save the space!). Is it advisable to combine the 2 ducts in the picture below into one? I've already moved the duct closest to the wall about 4 inches closer to the wall(think installers did a bad job). I'm thinking of getting a Y or T joint and daisy chain the 2nd duct from the wall into the 1st one. They're 2 different sizes as you can probably tell; I think on is 8" and the other 10".

Wish there's a way to post them here instead of externally through a url, but here's pictures of the ductwork(:
a's Site - Ductwork that needs combining/relocation

Was thinking of using something like this:
Saddle Tap Tee Wyes: American HVAC Parts

or:
Tee Wyes: American HVAC Parts

combined with a 45 or 95 degree adjustable.

Thanks in advance for any replies/suggestions.
 
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Old 11-21-10, 07:24 AM
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Best practice is to use two ducts! If you were to use one duct you would still have to increase the size of the one line.
 
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Old 12-03-10, 09:54 AM
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Originally Posted by airman.1994 View Post
Best practice is to use two ducts! If you were to use one duct you would still have to increase the size of the one line.
The longer duct line(bigger in diameter) in picture 1 goes to the master bedroom on the 2nd floor, but we already have 2 ducts going into the room from the same side. Most of the time I close one of the vents anyway to keep the heat from running too much - only have 1 zone. So, I'm not really concerned about restricting airflow to this. Am being stubborn here I know. What do you think?
 
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