I have a wooden house with a brick chimney up the middle (ca. 1925). Currently an oil burner and an ugly old enamel wood burner are attached to it. Those two are going to go and a new wood burner installed (Dovre or Jotul). Obviously the existing flue needs to be checked out, However I could do with some advice on flue design. The stove will go directly in front of the chimney. The obvious flue design is a rear exit flue from the stove, horizontally into the stack. However I have also been pondering a top exit, with a vertical steel flue for say 1 to 1.5 meters, then a 45 or 90 bend to enter the stack. Seems to me this could have the following advantages - more heat into the room from the exposed flue - inspection hatch just below the bend to see how things are in there with downsides of: - greater cost - colder gases entering the stack leading to greater buildup? Any views on my options here?