Duravent Stove Pipe DuraTech Elbow Kit 15 Degree SS, 5"

The 15-degree elbow kit is the correct choice when the obstruction to be routed around requires only a shallow deviation from vertical — for example, a narrow rafter or joist that is positioned close to the intended chimney centerline and requires only a small lateral displacement to clear. The 15-degree offset produces a more gradual, shallower angle than the 30-degree kit, meaning the chimney stays closer to vertical throughout the offset section. This is preferable where the obstruction can be cleared with a shallower angle because it minimises the horizontal component of the offset run, which in turn preserves stronger draft performance and reduces the rate of creosote accumulation in the offset section compared to a steeper 30-degree offset run.

Yes, both 15-degree and 30-degree elbow pairs can be used in the same DuraTech chimney installation where the routing geometry requires it — for example, one offset using 15-degree elbows at one level and a separate offset using 30-degree elbows at another level. Each elbow pair independently must not produce an offset greater than 30 degrees from vertical, and the total number of elbow pairs in the installation must comply with the DuraTech installation instructions and local building code requirements. The same twist-lock connection interface is used by all DuraTech 5-inch components regardless of elbow angle, so mixing 15-degree and 30-degree pairs with straight pipe sections in the same run presents no compatibility issue.

The lateral offset distance produced by an elbow pair depends on both the elbow angle and the length of the offset pipe section connecting the two elbows. For a given connecting pipe length, a 15-degree elbow pair produces a smaller lateral displacement than a 30-degree elbow pair — the shallower angle means the chimney moves less distance horizontally for each inch of height gained through the offset section. If a larger lateral displacement is needed to clear a wide obstruction, the 30-degree elbow kit or a longer connecting pipe section between 15-degree elbows would be required. The required lateral offset distance should be calculated from the installation dimensions before selecting the elbow angle.

The 360-degree swivel allows each elbow to be rotated to direct the offset in any azimuthal direction relative to the chimney centerline — north, south, east, west, or any intermediate compass bearing. This is essential because the obstruction to be cleared may be positioned in any direction from the chimney centerline, and the elbow must be oriented so the offset moves the chimney in precisely the direction needed to clear the obstruction. Without the 360-degree swivel, an elbow can only offset in a fixed direction, which would make it impossible to route around obstructions that are not aligned with a predetermined offset direction. The swivel allows the elbow pair to be set during installation to produce exactly the required offset direction regardless of the obstruction's position.

The same 2-inch minimum clearance to combustibles required throughout the DuraTech 5-inch chimney system applies at all elbow locations in an offset run. This clearance must be maintained between the outer surface of the elbow and any combustible building material — including the framing members, sheathing, flooring, and other combustible components that may be immediately adjacent to the elbow in the offset section. Because an offset section routes the chimney laterally, the clearance to combustibles must be verified not only above and below the elbows but also at all sides of the offset run where combustible materials may be closer to the pipe than in a standard vertical run.

A complete DuraTech 5-inch chimney system using the 5DT-E15KSS requires straight pipe sections in the appropriate nominal lengths — such as the 5DT-09SS and 5DT-12SS — to build the vertical sections above and below the offset, as well as a connecting pipe section between the two elbows in the offset pair. Ceiling and floor support boxes are required at all floor and ceiling penetrations. A firestop radiation shield is required at penetrations where a support box is not used. A roof flashing matched to the roof pitch, a storm collar, and a chimney cap complete the exterior termination. The 5DT-E30KSS 30-degree elbow kit is the alternative offset option when a steeper offset angle is required. All components must remain within the DuraTech 5-inch system family.