After many moons of research, I ended up buying the Rika Integra II to replace the old Austroflamm Integra I.. Since they did not appear to change the front of the stove, I stupidly assumed their engineers did not change the back – ELWRONGAMUNDO! They raised the combustion motor exhaust flue 2”. When I pulled out the inside of the Pellet-Pro wall thimble, I noted that it was up against the lowest fixed window mullion in the picture and cannot go up any further in the current configuration. On horizontal exhaust venting, I already know it is not recommended to drop down before going through the wall as doing so could cause smoke drafting problems since heat rises. The Contractor who built the room and created the wall thimble "wall" suggested that I replace the fixed awning window in the lowest opening, remove the fixed window 2nd from the bottom, recreate the wall thimble "wall" and go out that way. MY QUESTION: If I follow his advice, I would have to hook up a combination of two 45 or 90 degree elbows to be able to get up to where the wall thimble will be at the lower side of the 2nd window from the bottom in the attached picture. Are those two turns going to be a problem where the horizontal pipe is only 18" including the temination cap?