06-25-2009, 07:19 PM
Gary, in all likelihood, that pipe would be one of a fairly small diameter, lagged with formed asbestos, then covered with sheet metal. A single "A" frame support, located somewhere near the mid-point, should be sufficient, although you could also put another beneath the elbow if you think that it would improve the appearance. It seems to me that I've also seen such pipes supported by catenary, much like wire for overhead current collection.
Wayne
Wayne