I have a woodstove with a double wall metal chimney going straight up through the roof. The house is a modified A-frame, with a very steep roof. When we added 8 feet onto the house, the stove that was in a corner is now 8' from the end of the house. Now the smoke blows down or just settles on the house and yard. We don't want to move the stove into the "new" corner. I am thinking about putting a 90 degree elbow on the chimney where it exits from the roof, running about 8 feet of horizontal pipe, another 90 degree elbow, and straight up as high as the chimney needs to be. We have already increased the height of the existing chimney to about 5 feet to 11 feet, above the peak of the roof, but that didn't help. Any thoughts on my idea, or any other suggestions?