Aside from the fact that it is not properly pitched upward, the photo above shows what appears to be an okay flue pipe. A good home inspector, however, will look at an item from more than one angle. The next photo shows what this same flue pipe looks like from the other side where it connects into the boiler flue pipe. Photo taken by Dennis Robitaille of Able Home Inspection
In many cases a mirror must be used to view items in tight locations. These holes in the flue pipe can allow flue gases to escape into the living area. The flue gases contain CO (carbon monoxide) which is a deadly gas.
Photo taken by Dennis Robitaille of Able Home Inspection