Hello, this is my first post here. I have about two years of experience working with fabrication parts in Revit, and about 6 months of creating parts in Fabrication CADmep.

My foreman has asked me to design a rectangular 45 degree duct elbow that reduces from about 38" to 20". The tricky part is that he assures me that both throat lengths can and need to be 4" as shown here:

The only pattern I can find that will allow me to create something like this is CID 526. As shown here:

However, once I reload the configuration in Revit and try to place the part, it reverts to a 90 degree bend and the angle parameter is gone:

I've tried locking the parameter in Fabcad, creating a Catalogue Item, and creating a Product List with the Angle constrained. I'm simply at a loss and any help would be greatly appreciated!

 Is there a way to get that angle parameter, or even just the value to cross over? Or Is there another pattern that would work better than 526?

Thank you for your time,

-Chad