Are elbows also double walled?

[Jotel me this]

I have 2-30 degree elbows in the attic. are they double walled as well?

id assume so, just asking out of curiosity how the manufacturers would even make such a thing.

 

[Ludlow]

Yes. Made like this:

 

[Jotel me this]

Yes. Made like this:

OoOOoOOooooooooooooooooo