Duravent Stove Pipe DuraTech Chimney Pipe SS, 5" x 12"

The 5DT-12SS and 5DT-09SS are identical in construction, materials, and system specifications — both are DuraTech 5-inch inner diameter double-wall stainless steel Class A pipe sections. The only difference is length: the 5DT-12SS has a nominal length of 12 inches while the 5DT-09SS has a nominal length of 9 inches. The 12-inch section is selected when the chimney run calculation requires a 12-inch nominal increment to achieve the correct total installed height. When planning a DuraTech chimney run, installers typically combine pipe sections of different nominal lengths — including 6-inch, 9-inch, 12-inch, 24-inch, 36-inch, 48-inch, and 60-inch sections — to achieve the precise total height needed after accounting for the 1-1/4 inch overlap deduction at each joint.

The nominal length of the 5DT-12SS is 12 inches, but each DuraTech pipe connection involves a joint overlap where one pipe section slides into the next. DuraVent specifies that 1-1/4 inches must be subtracted from each joint overlap when calculating the installed length of a DuraTech pipe section. For a 12-inch nominal section with one overlap connection, the installed length contribution to the chimney run is approximately 10-3/4 inches. This deduction must be applied at each connection point throughout the entire chimney run to calculate the accurate total installed height of the system before ordering components.

The inner wall of a Class A chimney pipe is the component that is directly exposed to the full temperature and corrosive character of flue gases during every firing cycle. Thicker inner wall material provides greater resistance to the gradual corrosion and oxidation that flue gases impose on the inner wall surface over the service life of the chimney system, particularly during chimney fires when temperatures can spike dramatically above normal operating temperatures. DuraVent's 25-percent-thicker inner wall extends the effective service life of the pipe by providing more material mass before corrosion can penetrate through the wall, maintaining the structural integrity of the flue containment for longer than thinner-wall competitive products under equivalent operating conditions.

The 2,100°F HT designation means the DuraTech chimney system has been tested and listed under the UL 103 standard's high-temperature protocol, which includes three ten-minute chimney fire tests at 2,100°F in addition to one hour at 1,400°F. This listing confirms the system is rated to withstand the temperatures generated during a chimney fire event — a sudden extreme temperature event caused by ignition of accumulated creosote deposits in the flue. The HT listing is required by the installation instructions and certification labels of wood stoves, fireplaces, and other solid-fuel appliances that specify a 2,100°F rated chimney. Not all double-wall chimney systems carry the HT listing — installers must confirm the chimney system listing matches the appliance's specified requirement.

Yes. All DuraTech 5-inch pipe sections and fittings — including pipe lengths of different nominal sizes, elbows, tees, support boxes, flashings, caps, and other system components — are designed to connect together within the DuraTech 5-inch system using the same twist-lock connection interface. The 5DT-12SS connects directly to any other DuraTech 5-inch component using the same twist-lock joint without adapters. The system is designed to be planned and built from combinations of available pipe lengths and fittings to achieve the required total installed height and routing geometry for each specific installation. All components must be from the DuraTech 5-inch diameter product family to maintain system listing and warranty validity — components from other DuraTech diameter sizes or from other chimney system brands must not be mixed into a DuraTech 5-inch installation.

DuraVent's limited lifetime warranty on the DuraTech system requires annual inspection, maintenance, and cleaning by a certified chimney sweep. After each annual service, the certified chimney sweep must complete and date the appropriate section of the warranty card provided with the chimney system. This annual inspection requirement serves both warranty maintenance and safety purposes — annual chimney inspections identify creosote accumulation, physical damage, joint separation, and other conditions that must be addressed before the heating season to maintain safe and effective chimney operation. The warranty does not cover damage caused by chimney fires, which regular cleaning and inspection are designed to prevent by keeping creosote accumulation below ignition levels.