Cosninety wrote:A) Can the rigid duct fork immediately in two directions once it penetrates the bearing wall?
Yes.
B) Can the supply duct pass by or in front of the return duct?
Don't cross. Leave daylight.
C) Can the duct turn inside the shaft?
It shouldn't.
D) Can the duct fork in two directions from the shaft?
If you mean in the shaft, don't do that. And don't penetrate the riser twice unless absolutely necessary.
Cosninety wrote:B) What do you mean by "leave daylight"? If the return duct is shorter so that it doesn't intersect with the supply, can the supply pass in front of it?
The definition of daylight.
C) It shouldn't? Can it?
Well, of course it can. You drew it. I meant what I said.
D) Yes, I mean, can the supply branch in two directions from the shaft and penetrate on two different sides of the bearing wall?
Answered.
cjamal wrote:In terms of B, I think its easily avoidable to have the return go in a completely separated direction than the supply thus avoiding any issue of crossing. For instance, in the first example you provided (building systems questions PDF), just have the return riser go straight up. Then it avoids the supply completely. You could also have the supply go straight up and then bend outside of the shaft which would avoid your problem C as well. But like coach said, you shouldnt have to have 2 supply runs going through the shaft. Look at other examples of postings to see how others are accomplishing this.
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