Many of my friends in the real world and in social community or some of my students ask a question about this subject then how we can do this DUCT WITH SLOPE . In the real Project you have many situation then you need ducts with slope like Kitchen and many other Exhaust system and etc.
As you see in the below picture when you run Duct command in Revit you can’t find any option for create duct system with slop
And answer is very simple you can do this with Revit , all thing you need is change the type for duct from Rectangular or Oval to Round if you do this then you can find new option for create duct system in Revit , this is what you need for create duct system with slope.
But what about the shape of the Ducts ?!? This is not serious problem because you can use change Type command and convert the Round type duct to Rectangular or Oval shape.
As you see this is very simple in Revit .