I think the pipes coming out of it would "break" the circle. Though this would be a question for someone like Bob, or Jim, I suppose.
Maybe. They'd be close enough to the circle to do it, I suppose. To me, that begs the question: Do circles have effective height in the Dresden Files? If it's something absurd, like, I don't know, seven miles, then I'd say it functionally doesn't matter in all but a handful of cases (such as, for example, when fighting a 7.001-mile-jumping-demon). Or is it mostly to do with intent? I think intent would have to have something to do with it, because otherwise tree branches and things a dozen feet off the ground could mess things up. That falls in line with breaking a circle being an act of will, right? So, if Dresden thought that the pipes would break the circle, then they probably would?
I'm in the middle of my umpteenth yearly reread; I really should have this kind of thing down pat by now.