I have a problem, how connect two rectangular hole along project curve with twist duct?
Is this what you want
No one knows the answer to this question?
Yes, thank you
And how the duct is divided into 4 separate section for sheet metal and flatten sheet?
You need to create 4 individual components and do that by inserting a "New Part" and use a 3d sketch, then convert entities and do a bend loft - see attached
I can not open the file.
Could be possible that file is higher version than what you've on the machine.
No, I think that this is because the assembly file does not contain a component file.
I see you have 2014 SW
Let me attach all the files - then try it - what you need to do is put your original part in an assembly and save it. Then add a new part - start with a 3D sketch and select an edge convert the entities then close the sketch - open another 3D sketch select another edge convert the entities and close the sketch - then do a Loft Bend feature, select both sketches and input the thickness - you need to repeat that for all four sides.
Here are the parts
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