I've never seen this photo before. Is it from a real estate company?
I see a quartet of large-bore steel pipes closest to the viewer and it is these that I think you are calling the heat exit for the container that housed the graphene production facility owned by Rossi's fake JM Products company. That isn't quite right, however.
Photos that IH personnel took in Feb 2016 at the end of the 1-year test do not show the pipes where you see them now. In fact they don't appear at all in any of the pictures. Instead they first appeared (in their present position) in the April 2017 walkthrough of the Doral site by the contesting parties in Rossi's court case. In other words, they appeared after people here had noticed that the claimed 1MW heat production by the ecats would roast people alive if it wasn't disposed of somehow. I think the idea was that the pipes were supposed to have originally been the ones that Rossi had used up in the mezzanine for the heat exchanger he said he built. They are supposed to be evidence that Rossi really did build a heat exchanger up there. They are now on the ceiling and wall of the main room because, as Rossi explained in one of his depositions, they were reused after the Doral test for some top secret project that he couldn't reveal. There isn't enough of them, however, to account for all the piping that Rossi said was up in the mezzanine.
Yes.
They line up with the four holes in a box (which I think covers the heat exchanger shown in one of the IH photos) behind the Black Container.
I vaguely wonder how hot those pipes would be by the time the ducted air made it to the ceiling vent, if the air began at 103 C at nearly ground level. Basically they are a radiator in that configuration.