 I guess I should have been more clear in my original post. I do t care if the run through the attic is near horizontal or on an angle. I just would really like (esthetically) for the chimney to come out the side of the building below the roofline, rather than having a box on the roof right near the roof edge. And I'm trying to understand if installers are refusing because (a) it's not allowed per code or (b) it's a bad idea for maintenance/performance reasons or (c) it should be fine but they just don't do it often. B bholler Chimney sweep Staff member Jan 00, 0000 00,000 central pa Jul 00, 0000 #00 chhamilton said: I guess I should have been more clear in my original post. I do t care if the run through the attic is near horizontal or on an angle. I just would really like (esthetically) for the chimney to come out the side of the building below the roofline, rather than having a box on the roof right near the roof edge. And I'm trying to understand if installers are refusing because (a) it's not allowed per code or (b) it's a bad idea for maintenance/performance reasons or (c) it should be fine but they just don't do it often. 