I think I know the answer, but want to double check. In the attached image, what is the flexible joint in the duct work? What's the purpose? This system has it on the return side. Is the supply supposed to have one too?
Hey Guys this is my first post, I looked through the forum and could not find an answer.
I have a 1500sf house built in 1946 that had an addition added years ago. When they added the addition instead of hooking up to the current furnace... they added another one.
I am currently doing some...