Problem with T-junction round ducts

[dirk_h]

Hi,

I'm facing with following problem (RVT 2020) :

When i draw a round duct in a horizontale plane, starting from a verticale duct, Revit makes a junction and uses the Tee. This gives a correct result...but only when I draw the duct at angle of 0,90,180 or 270°.

When I draw the duct i.e. at angle of 45°, Revit uses not a Tee under 45°, but places it at 0,90,180 or 270°and use then elbow pieces..

Duct settings :

Any suggestions?

Thanks in advance!

Dirk

[iainsavage]

I’m not at my desk just now so can’t test this but I think if, in plan, you rotate the vertical duct 45 degrees around its centreline axis it might behave the way you want. 

[hmunsell]

so what is the issue? do you not want a Tee, or do you want to draw it at a specific angle?

[iainsavage]

Tested this and rotating the vertical duct does allow the branch to come off at 45 degree angle.

[dirk_h]

I"d like to draw a vertical round ventilation duct, in a shaft of a on appartment building. The branches for ventilation towards the appartments on floor 1-5 (app type A) should be positioned at angle 90°, and towards the appartments on floor 6-10 (app type B) at angle 45°. Rotating the vertical duct seems only an option if you to decide to first make all the brances for each floor and make the connection between branches and the ducts in the appartments at the last moment....

[iainsavage]

I tried a couple of things which seem to do what you want.

First I modelled the riser duct as a duct placeholder rather than a duct. This allowed branches at any angle and then when I converted the placeholder it retained those connections. (This method only worked with a particular duct routing option using a particular branch family)

The second method that I tried was:

Draw the riser full height.

Between floors 5 and 6 use the split tool to insert a union.

Pull the ducts apart to get a physical gap between them, then delete the union.

Go to on of the upper floor plans and rotate the riser duct through 45 degrees around its own axis.

Place and connect the branch ducts on each level.

Rejoin the top part of the riser to the bottom part.

Either way, I assume you are making use of the the copy and "Paste to Selected Levels" option to reduce modelling the same duct layouts on each floor? Then join up the vertical riser?

Hope this helps but re-post if you need more.