In my search for a new stove for next season I've been looking carefully at the number of bends I'll have to use in the stovepipe in order to adapt to my chimney. My chimney has clay flue tile and has a 45° bend in it and exits downward. Someone basically built it similar to a fire place, but never used it that way, I don't think they ever intended to, and an insert wouldn't fill up the arch (leaving an ugly hole). So basically, it was set up pretty dumb and the draft is no good with my current stove (which has an oval top vent so it requires two 90° bends in the stovepipe to attach to the chimney) I've been looking at stoves, trying to decide how I'll plumb the stove pipe up to the chimney. I could get a top venting stove and put two 45° bends in it, a rear venting stove with one 90° or two 45° bends in it, or I see that the Avalon Raineer is available with a 45° exit vent. Some stoves are capable of being either a top or a rear vent depending on how it is setup. Would one of these venting options be considered a 90° bend and thus rob the chimney of some of it's draft?