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Old 01-05-2012, 09:00 PM   #1
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Duct part identification


Can someone please tell me the name of the duct work piece that goes from a 4" round to a flat and back to a round. This piece is to create room to get other piping past the duct work. Also a concise explanation of how to install it would be nice as well. The ones that I currently have in my house just seem to be attached with a screw.

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Old 01-05-2012, 09:05 PM   #2
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Duct part identification


Square to round. This is located in line in a duct? Can you take a pic?

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Old 01-05-2012, 09:30 PM   #3
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Duct part identification


it not a very good pic but I need another one of these



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Old 01-05-2012, 09:36 PM   #4
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Duct part identification


That's actually 2 fittings with a short length of square duct between. Take the picture to any good plumbing / heating supply or one of the big box stores. And be careful with the advice you get at the big box stores. And measure everything, length and width of the square duct and size of the round.

Last edited by Missouri Bound; 01-05-2012 at 09:38 PM. Reason: additional info
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Old 01-05-2012, 09:42 PM   #5
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Duct part identification


sorry brain dead on this one...ben

Last edited by ben's plumbing; 01-05-2012 at 10:38 PM. Reason: wrong answer
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Old 01-05-2012, 09:54 PM   #6
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Duct part identification


Is there a tee fitting or tap in that as well?
It looks like there is something other than plain OSB immediately above it.
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Old 01-05-2012, 10:27 PM   #7
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Duct part identification


If that is 6" round pipe then what you have is two 12x3x6 stack boots with a piece of 12x3 1/4 stack inbetween them.
It looks like the top piece is hand made but it could be replaced with a 12x3x6 boot.
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Old 01-05-2012, 11:29 PM   #8
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Duct part identification


I dont know much about air flow, but common sense tells me that the duct in the picture would not be optimal for air flow ... looks to me like it would lower the pressure in that area, then have to squeeze the air back into the round duct. Seams to me that the static pressure there would not be so good. I could be wrong....
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Old 01-05-2012, 11:34 PM   #9
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Duct part identification


Quote:
Originally Posted by bobinphx View Post
I dont know much about air flow, but common sense tells me that the duct in the picture would not be optimal for air flow ... looks to me like it would lower the pressure in that area, then have to squeeze the air back into the round duct. Seams to me that the static pressure there would not be so good. I could be wrong....
Yep, you are wrong. The 6" duct is approx a 27 sq. in. opening......the 12 X 3 is.....well you know....36 sq in.
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Old 01-05-2012, 11:40 PM   #10
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Duct part identification


thanks for the clarification!!!! and I do mean it. I am just trying to learn and I appreciate the correction.
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Old 01-05-2012, 11:43 PM   #11
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Duct part identification


Quote:
Originally Posted by bobinphx View Post
thanks for the clarification!!!! and I do mean it. I am just trying to learn and I appreciate the correction.

You are very welcome.....and I appreciate your attitude.

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