Duct part identification

GravityMaster

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.

Doc Holliday

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

GravityMaster

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



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Missouri Bound

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.

ben's plumbing

sorry brain dead on this one...ben

TarheelTerp

Is there a tee fitting or tap in that as well?
It looks like there is something other than plain OSB immediately above it.

REP

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.

bobinphx

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....

Missouri Bound

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.

bobinphx

thanks for the clarification!!!! and I do mean it. I am just trying to learn and I appreciate the correction.

Missouri Bound

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